# Oklahoma Republican Governor runoff margin of victory? (Mike Mazzei)

On Aug 25, 2026

Updated: August 26, 2026

Category: Elections

Tags: Primaries

HTML: /markets/elections/primaries/oklahoma-republican-governor-runoff-margin-of-victory-mike-mazzei/

## Short Answer

**Key takeaway.** Both the **model** and the **market** expect Mike Mazzei, ≥**3%** for the Oklahoma Republican Governor runoff margin of victory, with no compelling evidence of mispricing.

## Key Claims (August 2026)

**- - Mike Mazzei's reported victory margin of 0.54-0.56% significantly underperformed all listed thresholds.** - Gentner Drummond significantly out-fundraised Mazzei in the runoff's final weeks.
- Donald Trump's endorsement was crucial for Mazzei's win, enabling a narrow victory.

## Executive Verdict

**Market prices 1.0% (1c) vs.** **0.1%** **model**, implying 100x payout given Mazzei's sub-threshold **0.56%** margin.

### Who Wins and Why

| Outcome | Market | Model | Why |
| --- | --- | --- | --- |
| Mike Mazzei, ≥6% | 1.0% | 0.1% | Mike Mazzei's runoff margin of victory was definitively reported as 0.54% to 0.56% on August 25, 2026. |
| Mike Mazzei, ≥3% | 1.0% | 0.1% | Mike Mazzei's runoff margin of victory was definitively reported as 0.54% to 0.56% on August 25, 2026. |
| Mike Mazzei, ≥9% | 1.0% | 0.1% | Mike Mazzei's runoff margin of victory was definitively reported as 0.54% to 0.56% on August 25, 2026. |

## Model vs Market

| Outcome | Market Probability | Octagon Model Probability |
| --- | --- | --- |
| Mike Mazzei, ≥6% | 1.0% | 0.1% |
| Mike Mazzei, ≥3% | 1.0% | 0.1% |
| Mike Mazzei, ≥9% | 1.0% | 0.1% |
| Mike Mazzei, ≥15% | 1.0% | 0.1% |
| Mike Mazzei, ≥12% | 1.0% | 0.1% |

- Expiration: August 25, 2027

## Market Behavior & Drivers

This market remained dormant near a 0.0% probability before experiencing a sharp, event-driven rally in its final week. A price spike to 37.0% on August 20 appears to have been triggered by a misinterpretation of an AI-panel estimate of Mazzei's probability of winning, which traders seem to have conflated with his margin of victory. This catalyst propelled the price to a peak of 69.0%, indicating strong market expectation of a decisive win.

The market collapsed on August 26, dropping 67.0 percentage points from 68.0% to a final price of 1.0%. This was driven by the announcement of official election results. Mike Mazzei secured victory, but by a narrow 0.56% margin. This slim victory did not meet the threshold for a "YES" resolution, effectively wiping out the contract's value. The total trading volume of 6,477 contracts shows moderate interest, but the price action was dictated entirely by the pre-election forecast and the final vote count, not by technical patterns or sustained liquidity. The chart's trajectory reflects a sentiment bubble that was abruptly corrected by the factual outcome.

## Significant Price Movements

### Outcome: Mike Mazzei, ≥6%

#### 📉 August 26, 2026: 67.0pp drop

Price decreased from 68.0% to 1.0%

**What happened:** The primary driver of the 67.0 percentage point drop on August 26, 2026, was the announcement of the official election results for the Oklahoma Republican gubernatorial primary runoff [[^]](https://www.facebook.com/NEWS9/videos/mike-mazzei-speaks-to-his-supporters-after-winning-the-republican-runoff-for-okl/898135623047287/). Mike Mazzei secured victory by a narrow margin of approximately 0.54% to 0.56% [[^]](https://www.facebook.com/NEWS9/videos/mike-mazzei-speaks-to-his-supporters-after-winning-the-republican-runoff-for-okl/898135623047287/), which fell significantly short of the "≥6%" margin specified in the market outcome. This traditional news event directly contradicted the high probability implied by the market's previous price for a larger margin. While President Donald Trump had endorsed Mazzei on Truth Social in the weeks preceding the runoff [[^]](https://apnews.com/article/oklahoma-governor-republican-runoff-trump-0d68fdd148f38abb1d3a833d10c69c3b), this social media activity influenced Mazzei's general candidacy but was irrelevant to this specific market price drop concerning the margin of victory.

### Outcome: Mike Mazzei, ≥3%

#### 📈 August 20, 2026: 54.0pp spike

Price increased from 0.0% to 54.0%

**What happened:** The 54.0 percentage point spike described for the "Oklahoma Republican Governor runoff margin of victory? (Mike Mazzei)" market appears to be based on a misinterpretation of available data. The 54% figure is attributed to an AI-panel estimate of Mike Mazzei's *probability of winning* the runoff, which reportedly contrasted with prediction market estimates at the time [[^]](https://www.oddsshopper.com/articles/prediction-markets/oklahoma-governor-runoff-odds). There is no evidence from the provided research of social media activity or traditional news causing a 54 percentage point shift in the expectation of a ≥3% margin of victory for Mazzei, who ultimately won by a narrow 0.56 percentage points on August 25, 2026 [[^]](https://votes.decisiondeskhq.com/races/2026-08-25/oklahoma-governor-republican-runoff). Therefore, social media was irrelevant as a driver for this seemingly mischaracterized prediction market movement.

## Contract Snapshot

A 'YES' resolution for a specific contract (e.g., "Mike Mazzei, ≥3%") occurs if Mike Mazzei's margin of victory in the Oklahoma Republican Governor runoff is equal to or greater than the percentage stated in the contract; otherwise, it resolves to 'NO'. Settlement for these markets is contingent upon the official certification of the election results. There is a maximum payout date of August 25, 2027.

## Market Discussion

Mike Mazzei won the Oklahoma Republican gubernatorial primary runoff against Attorney General Gentner Drummond on August 25, 2026 [[^]](https://www.nbcnews.com/politics/2026-election/mike-mazzei-winner-oklahoma-republican-governor-primary-trump-rcna593583)[[^]](https://tulsaworld.com/news/local/government-politics/elections/article_2dfdb523-bec7-42b4-9f7d-48d5af4170d2.html)[[^]](https://ktul.com/news/local/mike-mazzei-wins-republican-primary-runoff-for-oklahoma-governor-08-26-2026?teaserSource=). Mazzei secured 50.28% of the vote compared to Drummond's 49.72%, resulting in a victory margin of 0.56 percentage points based on 371,309 total votes counted [[^]](https://votes.decisiondeskhq.com/races/2026-08-25/oklahoma-governor-republican-runoff).

## Market Data

| Contract | Yes Bid | Yes Ask | Last Price | Volume | Open Interest |
| --- | --- | --- | --- | --- | --- |
| Mike Mazzei, ≥12% | 0% | 1% | 1% | $1,584.47 | $1,082.04 |
| Mike Mazzei, ≥15% | 0% | 1% | 1% | $2,553.52 | $1,373.63 |
| Mike Mazzei, ≥3% | 0% | 1% | 1% | $4,830.41 | $2,266.51 |
| Mike Mazzei, ≥6% | 0% | 1% | 1% | $6,477.05 | $4,008.29 |
| Mike Mazzei, ≥9% | 0% | 1% | 1% | $3,999.33 | $2,355.74 |

## How did the campaign finances and media spending of Mike Mazzei and Gentner Drummond compare in the final weeks before the August 25, 2026 runoff?

Drummond Cash on Hand | $1,009,347 (as of August 10, 2026) [[^]](https://www.oklahoman.com/story/news/politics/elections/2026/08/19/oklahoma-runoff-elections-2026-governor-fundraising-gentner-drummond-mike-mazzei/91359419007/)[[^]](https://www.news9.com/oklahoma-politics/drummond-mazzei-report-multimillion-dollar-fundraising-hauls-ahead-of-gop-runoff)[[^]](https://okcfox.com/news/local/gubernatorial-campaign-finance-reports-show-stark-contrasts-in-loans-donors-and-spending-mike-mazzei-gentner-drummond-cyndi-munson) |
Mazzei Self-Funding | Over $11 million in personal loans [[^]](https://www.oklahoman.com/story/news/politics/elections/2026/08/19/oklahoma-runoff-elections-2026-governor-fundraising-gentner-drummond-mike-mazzei/91359419007/)[[^]](https://okcfox.com/news/local/gubernatorial-campaign-finance-reports-show-stark-contrasts-in-loans-donors-and-spending-mike-mazzei-gentner-drummond-cyndi-munson)[[^]](https://www.kosu.org/oklahoma-gop-runoff-funding)[[^]](https://news.ballotpedia.org/2026/08/11/state-lawmakers-enacted-37-bills-on-ballot-measures-and-direct-democracy-through-mid-2026-2/) |
Runoff Winner Vote Share | Mike Mazzei with 50.3% of the vote [[^]](https://www.oklahoman.com/story/news/politics/elections/2026/08/25/oklahoma-runoff-election-results-2026-governor-race-gentner-drummond-mike-mazzei/91342715007/)[[^]](https://www.koco.com/article/oklahoma-election-results-republican-governor-runoff/73486448)[[^]](https://www.washingtonpost.com/elections/results/2026/08/25/oklahoma-governor-gop-primary-runoff-2026-live-results/) |

**Gentner Drummond significantly out-fundraised Mike Mazzei in the final weeks**

Gentner Drummond significantly out-fundraised Mike Mazzei in the final weeks. From June 2 to August 10, Drummond raised **$2.93** million, spent **$2.21** million, and concluded with **$1,009,347** cash on hand [[^]](https://www.oklahoman.com/story/news/politics/elections/2026/08/19/oklahoma-runoff-elections-2026-governor-fundraising-gentner-drummond-mike-mazzei/91359419007/)[[^]](https://www.news9.com/oklahoma-politics/drummond-mazzei-report-multimillion-dollar-fundraising-hauls-ahead-of-gop-runoff)[[^]](https://okcfox.com/news/local/gubernatorial-campaign-finance-reports-show-stark-contrasts-in-loans-donors-and-spending-mike-mazzei-gentner-drummond-cyndi-munson). In contrast, Mazzei raised **$945,919,** spent **$1.42** million—exceeding his fundraising—and held **$151,735** cash on hand [[^]](https://www.oklahoman.com/story/news/politics/elections/2026/08/19/oklahoma-runoff-elections-2026-governor-fundraising-gentner-drummond-mike-mazzei/91359419007/)[[^]](https://www.news9.com/oklahoma-politics/drummond-mazzei-report-multimillion-dollar-fundraising-hauls-ahead-of-gop-runoff)[[^]](https://okcfox.com/news/local/gubernatorial-campaign-finance-reports-show-stark-contrasts-in-loans-donors-and-spending-mike-mazzei-gentner-drummond-cyndi-munson).

Campaign funding strategies differed significantly between candidates during the runoff period. Drummond's campaign primarily relied on individual and PAC contributions, supplemented by a **$500,000** personal loan during this time [[^]](https://www.oklahoman.com/story/news/politics/elections/2026/08/19/oklahoma-runoff-elections-2026-governor-fundraising-gentner-drummond-mike-mazzei/91359419007/)[[^]](https://okcfox.com/news/local/gubernatorial-campaign-finance-reports-show-stark-contrasts-in-loans-donors-and-spending-mike-mazzei-gentner-drummond-cyndi-munson)[[^]](https://www.kosu.org/oklahoma-gop-runoff-funding). Mazzei's campaign was heavily self-funded, with over **$11** million of his **$12.47** million total funding coming from personal loans [[^]](https://www.oklahoman.com/story/news/politics/elections/2026/08/19/oklahoma-runoff-elections-2026-governor-fundraising-gentner-drummond-mike-mazzei/91359419007/)[[^]](https://okcfox.com/news/local/gubernatorial-campaign-finance-reports-show-stark-contrasts-in-loans-donors-and-spending-mike-mazzei-gentner-drummond-cyndi-munson)[[^]](https://www.kosu.org/oklahoma-gop-runoff-funding)[[^]](https://news.ballotpedia.org/2026/08/11/state-lawmakers-enacted-37-bills-on-ballot-measures-and-direct-democracy-through-mid-2026-2/). Both campaigns extensively utilized television and digital advertising, contributing to over **$14** million in total spending during the 10-week runoff period, much of which came from independent groups [[^]](https://www.oklahoman.com/story/news/politics/elections/2026/08/19/oklahoma-runoff-elections-2026-governor-fundraising-gentner-drummond-mike-mazzei/91359419007/)[[^]](https://apnews.com/article/oklahoma-governor-republican-runoff-trump-0d68fdd148f38abb1d3a833d10c69c3b). Mazzei focused his spending primarily on television ads and staffing [[^]](https://www.oklahoman.com/story/news/politics/elections/2026/08/19/oklahoma-runoff-elections-2026-governor-fundraising-gentner-drummond-mike-mazzei/91359419007/)[[^]](https://apnews.com/article/oklahoma-governor-republican-runoff-trump-0d68fdd148f38abb1d3a833d10c69c3b), while Drummond prioritized strategic consulting, staffing, and advertising [[^]](https://www.oklahoman.com/story/news/politics/elections/2026/08/19/oklahoma-runoff-elections-2026-governor-fundraising-gentner-drummond-mike-mazzei/91359419007/)[[^]](https://apnews.com/article/oklahoma-governor-republican-runoff-trump-0d68fdd148f38abb1d3a833d10c69c3b).

Both campaigns engaged in extensive advertising, but Mazzei ultimately prevailed. Despite Drummond's financial advantage, Mike Mazzei won the August 25, 2026 Republican gubernatorial runoff election, defeating Gentner Drummond with **50.3%** of the vote [[^]](https://www.oklahoman.com/story/news/politics/elections/2026/08/25/oklahoma-runoff-election-results-2026-governor-race-gentner-drummond-mike-mazzei/91342715007/)[[^]](https://www.koco.com/article/oklahoma-election-results-republican-governor-runoff/73486448)[[^]](https://www.washingtonpost.com/elections/results/2026/08/25/oklahoma-governor-gop-primary-runoff-2026-live-results/).

## What was the measurable impact of Donald Trump's endorsement on Mike Mazzei's polling and media coverage relative to Gentner Drummond?

Endorsement Start | May [[^]](https://apnews.com/article/oklahoma-governor-republican-runoff-trump-0d68fdd148f38abb1d3a833d10c69c3b)[[^]](https://www.news9.com/politics/trump-renews-support-for-mazzei-criticizes-drummond-in-oklahoma-governor-runoff)[[^]](https://www.oann.com/newsroom/trump-endorses-mike-mazzei-in-okla-gop-runoff-calls-opponent-a-fake-republican/) |
Primary Election Outcome | Secured runoff spot, nearly even with Drummond [[^]](https://www.ap.org/news-highlights/elections/2026/the-cost-to-overcome-a-trump-endorsement-100-million-plus-more-takeaways-from-tuesdays-primaries/) |
Campaign Strategy | Leveraged Trump's endorsement to be authentic conservative choice [[^]](https://apnews.com/article/oklahoma-governor-republican-runoff-trump-0d68fdd148f38abb1d3a833d10c69c3b)[[^]](https://oklahomawatch.org/2026/08/25/as-voters-back-political-newcomers-mazzei-secures-gop-nomination-for-governor/)[[^]](https://tulsaworld.com/news/local/government-politics/elections/article_2dfdb523-bec7-42b4-9f7d-48d5af4170d2.html)[[^]](https://news.ballotpedia.org/2026/07/01/gentner-drummond-r-and-mike-mazzei-r-campaign-on-experience-and-trump-support-in-the-august-25-republican-runoff-for-oklahoma-governor/)[[^]](https://news.ballotpedia.org/2026/07/31/elections-ballotpedia-is-covering-in-august-2026/) |

**Donald Trump's endorsement was crucial for Mike Mazzei's campaign strategy**

Donald Trump's endorsement was crucial for Mike Mazzei's campaign strategy. This support served as a foundational element, enabling Mazzei to overcome a deficit in name recognition and establish himself as the authentic conservative candidate [[^]](https://apnews.com/article/oklahoma-governor-republican-runoff-trump-0d68fdd148f38abb1d3a833d10c69c3b)[[^]](https://oklahomawatch.org/2026/08/25/as-voters-back-political-newcomers-mazzei-secures-gop-nomination-for-governor/)[[^]](https://www.news9.com/politics/trump-renews-support-for-mazzei-criticizes-drummond-in-oklahoma-governor-runoff)[[^]](https://www.oann.com/newsroom/trump-endorses-mike-mazzei-in-okla-gop-runoff-calls-opponent-a-fake-republican/)[[^]](https://tulsaworld.com/news/local/government-politics/elections/article_2dfdb523-bec7-42b4-9f7d-48d5af4170d2.html)[[^]](https://news.ballotpedia.org/2026/07/01/gentner-drummond-r-and-mike-mazzei-r-campaign-on-experience-and-trump-support-in-the-august-25-republican-runoff-for-oklahoma-governor/)[[^]](https://news.ballotpedia.org/2026/07/31/elections-ballotpedia-is-covering-in-august-2026/). Throughout his campaign, Mazzei consistently highlighted Trump's "complete and total" endorsement as a central aspect of his platform [[^]](https://apnews.com/article/oklahoma-governor-republican-runoff-trump-0d68fdd148f38abb1d3a833d10c69c3b)[[^]](https://oklahomawatch.org/2026/08/25/as-voters-back-political-newcomers-mazzei-secures-gop-nomination-for-governor/)[[^]](https://tulsaworld.com/news/local/government-politics/elections/article_2dfdb523-bec7-42b4-9f7d-48d5af4170d2.html)[[^]](https://news.ballotpedia.org/2026/07/01/gentner-drummond-r-and-mike-mazzei-r-campaign-on-experience-and-trump-support-in-the-august-25-republican-runoff-for-oklahoma-governor/)[[^]](https://news.ballotpedia.org/2026/07/31/elections-ballotpedia-is-covering-in-august-2026/). The endorsement, initiated in May and reinforced over a 10-week runoff period, included explicit social media attacks from Trump, who labeled Gentner Drummond a "FAKE Republican" [[^]](https://apnews.com/article/oklahoma-governor-republican-runoff-trump-0d68fdd148f38abb1d3a833d10c69c3b)[[^]](https://www.news9.com/politics/trump-renews-support-for-mazzei-criticizes-drummond-in-oklahoma-governor-runoff)[[^]](https://www.oann.com/newsroom/trump-endorses-mike-mazzei-in-okla-gop-runoff-calls-opponent-a-fake-republican/).

The endorsement helped Mazzei reach the runoff election. Trump's backing was instrumental in Mazzei securing a spot in the runoff, as he concluded the crowded initial primary on June 16 nearly even with Drummond [[^]](https://www.ap.org/news-highlights/elections/2026/the-cost-to-overcome-a-trump-endorsement-100-million-plus-more-takeaways-from-tuesdays-primaries/).

Measurable polling and media coverage impacts are not available. Despite reports from news outlets such as News9.com and One America News Network on Trump's ongoing support for Mazzei and his criticisms of Drummond, the provided information does not include specific measurable effects on Mazzei's polling numbers relative to Drummond [[^]](https://apnews.com/article/oklahoma-governor-republican-runoff-trump-0d68fdd148f38abb1d3a833d10c69c3b)[[^]](https://www.news9.com/politics/trump-renews-support-for-mazzei-criticizes-drummond-in-oklahoma-governor-runoff)[[^]](https://www.oann.com/newsroom/trump-endorses-mike-mazzei-in-okla-gop-runoff-calls-opponent-a-fake-republican/). Furthermore, quantitative details regarding changes in media coverage or reach for either candidate directly attributable to the endorsement are not available [[^]](https://apnews.com/article/oklahoma-governor-republican-runoff-trump-0d68fdd148f38abb1d3a833d10c69c3b)[[^]](https://www.news9.com/politics/trump-renews-support-for-mazzei-criticizes-drummond-in-oklahoma-governor-runoff)[[^]](https://www.oann.com/newsroom/trump-endorses-mike-mazzei-in-okla-gop-runoff-calls-opponent-a-fake-republican/).

## What did the final pre-election polls from Oklahoma-based pollsters like SoonerPoll and Amber Integrated indicate for the Mazzei vs. Drummond margin?

Identified Pre-election Polls | None for Mazzei vs. Drummond runoff [[^]](https://votes.decisiondeskhq.com/races/2026-08-25/oklahoma-governor-republican-runoff) |
SoonerPoll Final Pre-election Data | Not available in research [[^]](https://votes.decisiondeskhq.com/races/2026-08-25/oklahoma-governor-republican-runoff) |
Amber Integrated Runoff Margin | Not detailed in research [[^]](https://www.facebook.com/koco5/posts/chantelle-navarro-koco-5-asked-oklahoma-gubernatorial-candidates-gentner-drummon/1497417862415621/) |

**The research did not identify specific final pre-election poll indications from Oklahoma-based pollsters, such as SoonerPoll or Amber Integrated, concerning the Mazzei vs**

The research did not identify specific final pre-election poll indications from Oklahoma-based pollsters, such as SoonerPoll or Amber Integrated, concerning the Mazzei vs. Drummond margin in the 2026 Republican gubernatorial runoff. Specifically, no pre-election polls were identified for the 2026 Mike Mazzei vs. Gentner Drummond Oklahoma Republican gubernatorial runoff [[^]](https://votes.decisiondeskhq.com/races/2026-08-25/oklahoma-governor-republican-runoff).

Individual Oklahoma pollsters' specific final data was unavailable. For SoonerPoll, the provided facts contained no information regarding its final pre-election polls for this specific race. While Amber Integrated conducted polling concerning the gubernatorial race during the cycle, the research did not detail specific final margin numbers from Amber Integrated for the Drummond-Mazzei runoff [[^]](https://www.facebook.com/koco5/posts/chantelle-navarro-koco-5-asked-oklahoma-gubernatorial-candidates-gentner-drummon/1497417862415621/). It was noted that the Cole Hargrave Snodgrass & Associates (CHS) poll primarily dominated the specific final margin numbers for the Drummond-Mazzei runoff in the final days [[^]](https://www.facebook.com/koco5/posts/chantelle-navarro-koco-5-asked-oklahoma-gubernatorial-candidates-gentner-drummon/1497417862415621/).

## What did historical turnout data from the 2018 Oklahoma GOP gubernatorial runoff suggest for the expected 2026 electorate?

2018 Oklahoma Republican gubernatorial runoff total votes | 302,208 [[^]](https://oklahoma.gov/content/dam/ok/en/elections/election-results/2018-election-results/2018-school-runoff-election-results/20180828-seb.pdf)[[^]](https://uselectionatlas.org/RESULTS/state.php?elect=4&f=0&fips=40&off=5&year=2018)[[^]](https://www.politico.com/election-results/2018/oklahoma/runoff/)[[^]](https://web.archive.org/web/20190125150703/www.ok.gov/elections/support/20180828_seb.html) |
2026 Oklahoma Republican gubernatorial runoff total votes | 371,309 [[^]](https://votes.decisiondeskhq.com/races/2026-08-25/oklahoma-governor-republican-runoff) |
2026 Oklahoma Republican gubernatorial runoff margin of victory | 0.56 percentage points [[^]](https://votes.decisiondeskhq.com/races/2026-08-25/oklahoma-governor-republican-runoff)[[^]](https://www.nytimes.com/interactive/2026/08/25/us/elections/results-oklahoma-governor-runoff.html)[[^]](https://www.nbcnews.com/politics/2026-primary-elections/oklahoma-governor-runoff-results)[[^]](https://www.facebook.com/NEWS9/posts/mike-mazzei-speaks-to-his-supporters-after-winning-the-republican-runoff-for-okl/1509575404540588/) |

**The 2018 Oklahoma GOP gubernatorial runoff recorded 302,208 total votes**

The 2018 Oklahoma GOP gubernatorial runoff recorded 302,208 total votes. Kevin Stitt secured victory in this election with **54.56%** of the vote, defeating Mick Cornett, who received **45.44%** [[^]](https://oklahoma.gov/content/dam/ok/en/elections/election-results/2018-election-results/2018-school-runoff-election-results/20180828-seb.pdf)[[^]](https://uselectionatlas.org/RESULTS/state.php?elect=4&f=0&fips=40&off=5&year=2018)[[^]](https://www.politico.com/election-results/2018/oklahoma/runoff/)[[^]](https://web.archive.org/web/20190125150703/www.ok.gov/elections/support/20180828_seb.html). This resulted in a margin of victory of 9.12 percentage points.

The 2026 runoff saw increased turnout and a much narrower outcome. The subsequent 2026 Oklahoma Republican gubernatorial runoff, held on August 25, 2026, registered a higher turnout of 371,309 votes [[^]](https://votes.decisiondeskhq.com/races/2026-08-25/oklahoma-governor-republican-runoff). Mike Mazzei won this election, garnering 186,678 votes (**50.28%**) against Gentner Drummond's 184,631 votes (**49.72%**) [[^]](https://votes.decisiondeskhq.com/races/2026-08-25/oklahoma-governor-republican-runoff). This outcome produced a very close margin of victory for Mazzei, at just 0.56 percentage points [[^]](https://votes.decisiondeskhq.com/races/2026-08-25/oklahoma-governor-republican-runoff)[[^]](https://www.nytimes.com/interactive/2026/08/25/us/elections/results-oklahoma-governor-runoff.html)[[^]](https://www.nbcnews.com/politics/2026-primary-elections/oklahoma-governor-runoff-results)[[^]](https://www.facebook.com/NEWS9/posts/mike-mazzei-speaks-to-his-supporters-after-winning-the-republican-runoff-for-okl/1509575404540588/).

The research findings do not explicitly link 2018 data to 2026. Despite presenting detailed outcomes for both the 2018 and 2026 runoffs, the provided information does not explicitly indicate what the 2018 turnout data suggested concerning the expected 2026 electorate.

## How did Mazzei's and Drummond's voter outreach strategies differ in key battleground areas like Oklahoma County and Tulsa County?

Runoff Advertising Spending | Over $14 million [[^]](https://oklahomawatch.org/2026/08/20/tax-hikes-democrat-donations-and-defending-trump-fact-checking-claims-made-in-runoff-election-ads/)[[^]](https://www.kgou.org/politics-and-government/2026-08-19/mazzei-drummond-talk-campaign-spending-endorsements-ahead-of-oklahoma-runoff) |
Runoff Outcome (OKC & Tulsa Co) | Gentner Drummond outperformed Mike Mazzei in both Oklahoma County and Tulsa County (August 25, 2026 runoff) [[^]](https://votes.decisiondeskhq.com/races/2026-08-25/oklahoma-governor-republican-runoff) |
Primary Outcome (OKC & Tulsa Co) | Drummond secured majority in Oklahoma County, Mazzei successful in Tulsa County (June 2026 primary) [[^]](https://www.koco.com/article/oklahoma-republican-governor-runoff-drummond-mazzei/71619881) |

**Mazzei and Drummond employed distinct statewide campaign strategies**

Mazzei and Drummond employed distinct statewide campaign strategies. Mike Mazzei's approach focused on leveraging President Donald Trump's endorsement, utilizing social media for attacks, financing advertising with his personal wealth, and presenting himself as an authentic conservative based on his past roles as state senator and Secretary of Budget [[^]](https://apnews.com/article/oklahoma-governor-republican-runoff-trump-0d68fdd148f38abb1d3a833d10c69c3b)[[^]](https://www.nbcnews.com/politics/2026-election/mike-mazzei-winner-oklahoma-republican-governor-primary-trump-rcna593583)[[^]](https://oklahomawatch.org/2026/08/25/as-voters-back-political-newcomers-mazzei-secures-gop-nomination-for-governor/)[[^]](https://www.oklahoman.com/story/news/politics/elections/2026/08/20/mike-mazzei-gentner-drummond-republican-runoff-election-2026-trump-support/91157680007/)[[^]](https://www.kgou.org/politics-and-government/2026-08-19/mazzei-drummond-talk-campaign-spending-endorsements-ahead-of-oklahoma-runoff)[[^]](https://news.ballotpedia.org/2026/07/01/gentner-drummond-r-and-mike-mazzei-r-campaign-on-experience-and-trump-support-in-the-august-25-republican-runoff-for-oklahoma-governor/). Gentner Drummond, conversely, highlighted his background as attorney general, military service, and ranching experience, aiming to attract moderate voters and signal independence from the political establishment [[^]](https://apnews.com/article/oklahoma-governor-republican-runoff-trump-0d68fdd148f38abb1d3a833d10c69c3b)[[^]](https://oklahomawatch.org/2026/08/25/as-voters-back-political-newcomers-mazzei-secures-gop-nomination-for-governor/)[[^]](https://www.oklahoman.com/story/news/politics/elections/2026/08/20/mike-mazzei-gentner-drummond-republican-runoff-election-2026-trump-support/91157680007/)[[^]](https://www.kgou.org/politics-and-government/2026-08-19/mazzei-drummond-talk-campaign-spending-endorsements-ahead-of-oklahoma-runoff)[[^]](https://news.ballotpedia.org/2026/07/01/gentner-drummond-r-and-mike-mazzei-r-campaign-on-experience-and-trump-support-in-the-august-25-republican-runoff-for-oklahoma-governor/). The runoff campaign was characterized by significant spending, with over **$14** million allocated to advertising, which frequently featured negative attacks regarding candidates' records, political contributions, and positions on projects like the Inola aluminum smelter [[^]](https://oklahomawatch.org/2026/08/20/tax-hikes-democrat-donations-and-defending-trump-fact-checking-claims-made-in-runoff-election-ads/)[[^]](https://www.kgou.org/politics-and-government/2026-08-19/mazzei-drummond-talk-campaign-spending-endorsements-ahead-of-oklahoma-runoff).

Local outreach specifics are unclear, but election results show differing county support. While the research outlines general campaign strategies, it does not detail how Mazzei's and Drummond's voter outreach specifically varied within key battleground areas such as Oklahoma County and Tulsa County. However, the outcomes of the election in these counties are recorded. Gentner Drummond notably outperformed Mike Mazzei in both Oklahoma County and Tulsa County during the August 25, 2026, runoff election [[^]](https://votes.decisiondeskhq.com/races/2026-08-25/oklahoma-governor-republican-runoff). In the initial June 2026 primary, Drummond had secured a majority of votes in Oklahoma County, whereas Mazzei achieved success in Tulsa County [[^]](https://www.koco.com/article/oklahoma-republican-governor-runoff-drummond-mazzei/71619881).

## What Could Change the Odds

**Mike Mazzei secured the Republican gubernatorial nomination in Oklahoma's primary runoff on August 25, 2026, defeating Gentner Drummond [[^]](https://www.oklahoman.com/story/news/politics/elections/2026/08/25/oklahoma-runoff-election-results-2026-governor-race-gentner-drummond-mike-mazzei/91342715007/)[[^]](https://www.news9.com/oklahoma-elections/oklahoma-governor-runoff-results-drummond-mazzei)[[^]](https://votes.decisiondeskhq.com/races/2026-08-25/oklahoma-governor-republican-runoff).** Mazzei received 186,678 votes (**50.28%**) against Drummond's 184,631 votes (**49.72%**), a margin of 0.56 percentage points from a total of 371,309 votes reported [[^]](https://votes.decisiondeskhq.com/races/2026-08-25/oklahoma-governor-republican-runoff). President Donald Trump's endorsement significantly influenced Mazzei's win [[^]](https://apnews.com/article/oklahoma-governor-republican-runoff-trump-0d68fdd148f38abb1d3a833d10c69c3b)[[^]](https://www.oklahoman.com/story/news/politics/elections/2026/08/25/oklahoma-runoff-election-results-2026-governor-race-gentner-drummond-mike-mazzei/91342715007/)[[^]](https://www.nbcnews.com/politics/2026-election/mike-mazzei-winner-oklahoma-republican-governor-primary-trump-rcna593583). Trump frequently posted in Mazzei's favor on Truth Social and characterized Drummond as a 'FAKE Republican' [[^]](https://apnews.com/article/oklahoma-governor-republican-runoff-trump-0d68fdd148f38abb1d3a833d10c69c3b)[[^]](https://www.oklahoman.com/story/news/politics/elections/2026/08/25/oklahoma-runoff-election-results-2026-governor-race-gentner-drummond-mike-mazzei/91342715007/)[[^]](https://www.nbcnews.com/politics/2026-election/mike-mazzei-winner-oklahoma-republican-governor-primary-trump-rcna593583).

**Key upcoming dates involve the certification of election results [[^]](https://oklahoma.gov/elections/elections-results/election-results/2026-election-results/august-runoff-primary-election.html).** County election board results are scheduled for certification no earlier than 5 p.m. on Friday, August 28, 2026 [[^]](https://oklahoma.gov/elections/elections-results/election-results/2026-election-results/august-runoff-primary-election.html). State and federal election results are set for certification on Tuesday, September 1, 2026 [[^]](https://oklahoma.gov/elections/elections-results/election-results/2026-election-results/august-runoff-primary-election.html).

**Key takeaway.** Following these certifications, Mazzei will proceed to the November 3, 2026, general election, where he will face Democratic nominee Cyndi Munson [[^]](https://apnews.com/article/oklahoma-governor-republican-runoff-trump-0d68fdd148f38abb1d3a833d10c69c3b)[[^]](https://www.nbcnews.com/politics/2026-election/mike-mazzei-winner-oklahoma-republican-governor-primary-trump-rcna593583)[[^]](https://oklahomawatch.org/2026/08/25/as-voters-back-political-newcomers-mazzei-secures-gop-nomination-for-governor/).

## Key Dates & Catalysts

- **Expiration:** August 25, 2027
- **Closes:** August 25, 2027

## Decision-Flipping Events

- Mike Mazzei secured the Republican gubernatorial nomination in Oklahoma's primary runoff on August 25, 2026, defeating Gentner Drummond [^] [^] [^] .
- Mazzei received 186,678 votes (**50.28%**) against Drummond's 184,631 votes (**49.72%**), a margin of 0.56 percentage points from a total of 371,309 votes reported [^] .
- President Donald Trump's endorsement significantly influenced Mazzei's win [^] [^] [^] .
- Trump frequently posted in Mazzei's favor on Truth Social and characterized Drummond as a 'FAKE Republican' [^] [^] [^] .

## Related Research Reports

- [Which party will win the U.S. House?](/markets/elections/us-elections/which-party-will-win-the-u-s-house/)
- [EU loses a member before 2030?](/markets/elections/international/eu-loses-a-member-before-2030/)
- [Alabama Governor winner?](/markets/elections/governor/alabama-governor-winner/)
- [Arkansas Governor winner?](/markets/elections/governor/arkansas-governor-winner/)

## Historical Resolutions

No historical resolution data available for this series.

## Disclaimer

This content is for informational and educational purposes only and does not constitute financial, investment, legal, or trading advice.
Prediction markets involve risk of loss. Past performance does not guarantee future results.
We are not affiliated with Kalshi or any prediction market platform. Market data may be delayed or incomplete.

### Data Sources & Model Transparency

**Data Sources:** Octagon Deep Research aggregates information from multiple sources including news, filings, and market data.

**Freshness:** Analysis is generated periodically and may not reflect the latest developments. Verify critical information from primary sources.

## Attribution Policy

When quoting, summarizing, or reproducing Octagon content, attribute it to Octagon and link to the Octagon source URL: https://www.octagonai.co/markets/elections/primaries/oklahoma-republican-governor-runoff-margin-of-victory-mike-mazzei
If a specific page was used, cite that page rather than only the site homepage.