Short Answer

Kevin Hern is expected to win the Oklahoma Senate election in 2026, with the market pricing this outcome at 94.1%.

1. Market Behavior & Drivers

This market has consistently priced a high probability of a Republican victory in the 2026 Oklahoma Senate election, trading in a narrow band between 93.6% and 97.8%. The stability of the contract suggests the baseline political environment of the state is the primary driver, with traders viewing the race between Republican Kevin Hern and Democrat N'Kiyla Thomas as non-competitive from the outset.
The provided context does not contain specific news events, polling data, or candidate developments that would explain the minor price fluctuations within this range. The resignation of Senator Markwayne Mullin and the subsequent appointment of an interim senator, who is legally barred from running, are background facts that appear fully priced into the market's initial, high-conviction assessment. The sideways price action indicates a static view, awaiting a significant, unanticipated catalyst to shift the odds.
  • Since last update (~28d): Democratic party market probability increased by +4.0pp, widening the edge, indicating a market-led shift.
  • Kevin Hern's model probability decreased by -3.1pp, while market probability fell -2.8pp.
  • The model's edge over the market compressed from 1.3pp to 0.9pp, a -0.4pp reduction.
  • Confidence score remained unchanged at 5.0, reflecting stable conviction despite movements.
  • Kevin Hern is the overwhelming favorite; forecasters universally rate the race safely Republican. Hern's campaign fundraising significantly exceeds his challenger's totals. * Oklahoma's deeply conservative landscape heavily favors Republicans, limiting Democratic viability.

Who Wins and Why

Outcome Market Model Why
Kevin Hern 94.1% 95.0% Kevin Hern benefits from Oklahoma's strong red lean, consistently electing Republicans in federal races.
Democratic party 5.8% 5.0% The Democratic party faces an uphill battle in deep-red Oklahoma, where Republicans consistently win federal races.

Current Context

Oklahoma's 2026 U.S. Senate election features Republican Kevin Hern and Democrat N'Kiyla Thomas. The general election is scheduled for November 3, 2026, to fill the Class II Senate seat [1][2][3]. Senator Markwayne Mullin's resignation created the vacancy. Governor Kevin Stitt appointed Alan S. Armstrong as an interim replacement in March 2026, though state law prohibits Armstrong from running in the 2026 election [1][4][5][3][6]. Republican Congressman Kevin Hern and Democrat N'Kiyla Jasmine Thomas are the major party nominees as of September 9, 2026 [1][5][7][3][8].
Forecasts consistently rate the Oklahoma Senate race as safely Republican. The race is widely considered a safe Republican seat by election forecasters and prediction markets [5][9][10][11]. Kevin Hern secured the Republican nomination with nearly 70% of the vote in the June 2026 primary [5]. Decision Desk HQ forecasts Kevin Hern as safe to win the Oklahoma U.S. Senate election [7].
Key deadlines remain for the November 3, 2026 general election. The voter registration deadline is October 9, 2026 [2][12][13]. Early voting begins on October 29, 2026 [2][12][13].
Sources (13)
  1. 12026 United States Senate election in Oklahomaen.wikipedia.org
  2. 2[PDF] 2026 Statutory Election Dates and Deadlines | Oklahoma.govoklahoma.gov
  3. 3United States Senate election in Oklahoma, 2026 - Ballotpediaballotpedia.org
  4. 4Trump-backed Rep. Kevin Hern wins GOP Senate nomination in Oklahoma | AP Newsapnews.com
  5. 5Democratic Socialist N’Kiyla Jasmine Thomas Wins Oklahoma Democratic Senate Primary Runoff, Setting Up Uphill General Election Battle Against Rep. Kevin Hernpolitical.org
  6. 6Sen. Alan Armstrong takes office — ending the day-long vacancy in Oklahoma’s class II seat - Ballotpedia Newsnews.ballotpedia.org
  7. 72026 Oklahoma US Senate Forecastvotes.decisiondeskhq.com
  8. 8United States Senate election in Oklahoma, 2026 (August 25...ballotpedia.org
  9. 9OK Senate 2026 | Cook Political Reportcookpolitical.com
  10. 10Oklahoma — U.S. Senate — 2026 forecast — Akashicakashic.app
  11. 11https://polymarket.com/event/oklahoma-senate-election-winnerpolymarket.com
  12. 12Oklahoma 2026 Election Guide | Show Up or Shut Upshowuporshutup.org
  13. 13Oklahoma 2026 Elections: Races, Ballot Measures, and Pollingwhatsonmyballot.info

2. Price Chart

Historical Price (Probability)

Outcome probability
Date

3. Market Data

Contract Snapshot

This Kalshi market resolves based on the winning party of the Oklahoma Senate race. A "Yes" resolution occurs if Kevin Hern, representing the Republican party, wins the election, while a "No" resolution occurs if he does not win. The market event begins on November 3, 8:00 AM EST, with the maximum payout date set for November 3, 2027.

Available Contracts

Market options and current pricing

Outcome bucket Yes (price) No (price) Last trade probability
Kevin Hern $0.97 $0.06 94%
Democratic party $0.06 $0.97 6%

Market Discussion

As of September 9, 2026, the 2026 Oklahoma U.S. Senate general election has not yet occurred, with the contest between Republican Kevin Hern and Democratic nominee N'Kiyla Jasmine Thomas scheduled for November 3, 2026 [1][2][3][4][5][6][7]. Prediction markets overwhelmingly favor Kevin Hern to win the seat, consistently showing implied probabilities between 96% and 98% [8][9][10][11]. Market commentary attributes this strong preference to Oklahoma's significant partisan lean and the perceived lack of a competitive path for the Democratic nominee [8][10].

Sources (11)
  1. 1United States Senate election in Oklahoma, 2026 - Ballotpediaballotpedia.org
  2. 22026 United States Senate election in Oklahoma - Wikipediaen.wikipedia.org
  3. 3Democratic Socialist N’Kiyla Jasmine Thomas Wins Oklahoma Democratic Senate Primary Runoff, Setting Up Uphill General Election Battle Against Rep. Kevin Hernpolitical.org
  4. 4Who won Oklahoma runoffs for labor, insurance, U.S. Senate and SD 34?journalrecord.com
  5. 5N'kiyla Jasmine Thomas wins U.S. Senate runoff, becomes Oklahoma's first 'democratic socialist' nomineenondoc.com
  6. 62026 Oklahoma US Senate | Live Election Resultsvotes.decisiondeskhq.com
  7. 72026 Oklahoma US Senate Live Election Results | DDHQnewsnation-votes.decisiondeskhq.com
  8. 8Kevin Hern Odds: Oklahoma Senate Race 2026 on Kalshioddsshopper.com
  9. 9Oklahoma Senate winner? Odds & Predictions 2026kalshi.com
  10. 10Will a Republican Win the Oklahoma Senate Race in 2026?lines.com
  11. 11Oklahoma — U.S. Senate — 2026 forecast — Akashicakashic.app

4. Trust Index

Octagon Trust Index Kalshi 79 Good
How it adds up
Integrity80% of score85Strong
Trade quality20% of score58Caution

Includes the cost to trade: a $10,000 order loses about 1% of the price to slippage.

Trust score79Good

Weighted blend with hard caps — a critically weak safety pillar, or a severe trading anomaly, caps the total regardless of the rest. Full methodology · About the Trust Index

Trust profile
Integrity4 screens run · 6 don't apply
Market integrity
85Strong

Outcome is hard to influence

No suspicious activity on any screen

Screened clean
Large tradesNo single trade dominates the tape. Clear
Thin-volume movesNo significant move Clear
Size patternsTrade sizes look organic. Clear
2 screens not run
Outcome control · doesn't apply to this market type
Thin-leg conviction · doesn't apply to this market type
Info fairness
80Good

Structural prior — no screens apply

No suspicious activity on any screen

Screened clean
Information exposureNo concentrated group can know the outcome materially early. Clear
4 screens not run
Move vs. catalyst · doesn't apply to this market type
Longshot repricing · doesn't apply to this market type
Pre-broadcast certainty · doesn't apply to this market type
Cross-venue timing · doesn't apply to this market type
Resolution quality
92Strong

Resolution mechanism is dependable

No suspicious activity on any screen

Resolution rules read: Clear

Liquidity
54Thin

Expect slippage beyond small size

2 contracts · worst first

N’Kiyla Thomas24
Very thin · low confidence

Light recent trading — size may not fill near the screen price.

Kevin Hern55
Thin · low confidence

Light recent trading — size may not fill near the screen price.

Book spread 1% vs realized 0%
Move quality
70Stable

No significant moves

2 contracts · worst first

Kevin Hern—
No significant move (3d)

Price was stable over the last 3 days.

N’Kiyla Thomas—
No significant move (6h)

Price was stable over the last 6 hours.

Rule clarity
100Clear

Counts toward Resolution quality, not here

2 contracts · worst first

Kevin Hern100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
N’Kiyla Thomas100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Trade quality
58Caution

Tradable, but expect execution cost beyond small sizes.

Outcome quality 55 (notional-weighted across 2 scored legs)

$100 order: 0.4c slippage (<1% of a 98.5c contract)

$1,000 order: 0.5c slippage (<1% of a 98.5c contract)

$10,000 order: 1.3c slippage (~1% of a 98.5c contract)

Kevin Hern55Market scoreLiquidity55Move quality–Rule clarity100
Why 55
Liquidity
55 · Thin · low confidence

Light recent trading — size may not fill near the screen price.

Book spread 1% vs realized 0%
Move quality
No significant move (3d)

Price was stable over the last 3 days.

Rule clarity
100 · Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
N’Kiyla Thomas24Market scoreLiquidity24Move quality–Rule clarity100
Why 24
Liquidity
24 · Very thin · low confidence

Light recent trading — size may not fill near the screen price.

Move quality
No significant move (6h)

Price was stable over the last 6 hours.

Rule clarity
100 · Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear

underwriting_v1.4 · computed Sep 26, 2026

5. How do major political forecasters like the Cook Political Report and Decision Desk HQ rate the 2026 Oklahoma Senate race?

Cook Political Report RatingSolid Republican [1]
DDHQ Win Probability (Kevin Hern)98% (as of September 2026) [2]
Prediction Market Odds (Kevin Hern)95% to 98% [3][4]
Major political forecasters universally rate the 2026 Oklahoma Senate race as safely Republican. The contest is widely considered a safe Republican seat, with The Cook Political Report rating it as Solid Republican [1]. Decision Desk HQ (DDHQ) also designates the race as "Safe Republican," forecasting a 98% win probability for Republican candidate Kevin Hern as of September 2026 [2]. Historically, DDHQ's rating for this seat was initially pending but has consistently been viewed as securely Republican [5][1].
Prediction markets reinforce the Republican candidate's strong advantage in the race. These markets strongly favor Kevin Hern, the Republican nominee, with probability odds consistently trading between 95% and 98% for him to win the 2026 Oklahoma Senate race [3][4]. Decision Desk HQ incorporates market-based data from platforms like Polymarket and Kalshi into its forecasting models, which currently show a clear advantage for the Republican candidate [6][7]. This special election is occurring due to the resignation of Markwayne Mullin [8]. Republican nominee Kevin Hern is running against Democratic nominee N'Kiyla Jasmine Thomas, with both candidates having advanced through earlier primary and runoff stages [8][9][1][10][11].
Sources (11)
  1. 1United States Senate election in Oklahoma, 2026 - Ballotpediaballotpedia.org
  2. 22026 U.S. Senate Forecast | Decision Desk HQvotes.decisiondeskhq.com
  3. 3Kevin Hern: 2026 Oklahoma U.S. Senate Polls & Odds | Prediction Edgepredictionedge.com
  4. 42026 Senate Races: All 35 Seats, Market by Marketpredictionmarketspicks.com
  5. 5Decision Desk HQ 2026 Senate Forecast - 270toWin.com270towin.com
  6. 62026 Oklahoma US Senate Marketsvotes.decisiondeskhq.com
  7. 72026 Oklahoma US Senate Marketsnewsnation-votes.decisiondeskhq.com
  8. 82026 United States Senate election in Oklahoma - Wikipediaen.wikipedia.org
  9. 9Oklahoma Senate Primary Election 2026 Live Results - NBC Newsnbcnews.com
  10. 10United States Senate election in Oklahoma, 2026 (August 25...ballotpedia.org
  11. 11United States Senate election in Oklahoma, 2026 (June 16...ballotpedia.org

6. How do the campaign fundraising totals and cash-on-hand compare between Kevin Hern and N'Kiyla Thomas according to the latest FEC filings?

Kevin Hern Total Receipts$9,953,578.89 (as of June 30, 2026) [1][2][3]
Kevin Hern Cash On Hand$2,491,910.11 (as of June 30, 2026) [1][2][3]
N'Kiyla Thomas Total Receipts$57,159 (as of August 5, 2026) [4][5][6][7]
Kevin Hern's fundraising totals significantly exceed N'Kiyla Thomas's. As of their latest FEC-related filings, Kevin Hern's campaign committee, HERN FOR SENATE, has reported significantly higher total receipts of $9,953,578.89. In contrast, N'Kiyla Thomas's campaign raised $57,159 [1][4][2][3][5][6][7].
Hern also maintains a substantially larger cash-on-hand balance. According to the July 2026 quarterly FEC report covering January 1, 2026, to June 30, 2026, Kevin Hern's campaign reported an ending cash-on-hand balance of $2,491,910.11 [1][2][3]. N'Kiyla Thomas's campaign, conversely, had approximately $456 in cash on hand as of her pre-run-off report dated August 5, 2026 [1][4][5][6][7].
Sources (7)
  1. 1Oklahoma Nurse Wins U.S. Senate Nomination With Just $455 Left...nurse.org
  2. 2HERN, KEVIN - Candidate overview | FECfec.gov
  3. 3HERN FOR SENATE - committee overview | FECfec.gov
  4. 4Democratic socialists notch another win in the Oklahoma Senate...nbcnews.com
  5. 52026 Oklahoma US Senate Forecast | DDHQvotes.decisiondeskhq.com
  6. 62026 Oklahoma US Senate Forecast | DDHQnewsnation-votes.decisiondeskhq.com
  7. 72026 Oklahoma US Senate Forecast | DDHQintegration-votes.decisiondeskhq.com

7. What are the key dates on the 2026 Oklahoma election calendar that could influence turnout for the Hern-Thomas race?

General Election DateNovember 3, 2026 [1][2]
Absentee Ballot DeadlineNovember 3, 2026 [3][4][1]
GOP Victory ProbabilityApproximately 98% [5][6][7][8]
Key dates in late 2026 will influence voter turnout. The general election for the Hern-Thomas race in Oklahoma is scheduled for November 3, 2026 [1][2]. This date also marks the deadline for returning absentee and mail-in ballots [3][4][1]. Voter participation is further influenced by the in-person early voting and absentee request period, which typically extends throughout October [3][4][1].
Past primary elections determined candidates for the general election. While the U.S. Senate primary election on June 16, 2026, and the Democratic primary runoff on August 25, 2026, have already occurred, these events were critical in establishing the candidates who will appear on the general election ballot [2].
High Republican victory probability may influence voter participation. A significant factor that could shape voter turnout in the Hern-Thomas race is the strong likelihood of a Republican victory. As of September 2026, prediction markets and election forecasting models estimate this probability at approximately 98% [5][6][7][8].
Sources (8)
  1. 1United States Senate election in Oklahoma, 2026 - Ballotpediaballotpedia.org
  2. 22026 United States Senate election in Oklahoma - Wikipediaen.wikipedia.org
  3. 32026 election and voting dates - Ballotpediaballotpedia.org
  4. 4Elections calendar - Ballotpediaballotpedia.org
  5. 5Kevin Hern Odds: Oklahoma Senate Race 2026 on Kalshioddsshopper.com
  6. 62026 Oklahoma US Senate Forecast | DDHQvotes.decisiondeskhq.com
  7. 72026 Oklahoma US Senate Marketsvotes.decisiondeskhq.com
  8. 82026 Oklahoma US Senate Forecast | DDHQnewsnation-votes.decisiondeskhq.com

8. What potential catalysts or campaign missteps between now and November 2026 could challenge Kevin Hern's position as the frontrunner?

Win Probability98% with projected R+23 margin (as of September 8, 2026) [1][2]
Race RatingSolid Republican / Safe Republican (R+50 PVI) [3][4][5]
Primary Vote Share69.76% (June 16, 2026) [6]
Kevin Hern remains the overwhelming favorite for the 2026 Oklahoma U.S. Senate election. Prediction markets, as of September 9, 2026, place his probability of winning at approximately 95% to 98% [3][7][4][5]. A specific forecast from September 8, 2026, projects a 98% win probability with an anticipated R+23 margin [1][2]. The race is consistently rated as 'Solid Republican' or 'Safe Republican,' reflecting Oklahoma's significant partisan skew, indicated by an R+50 Partisan Voter Index (PVI) [3][4][5].
Hern secured the Republican nomination with a substantial primary victory. He won the June 16, 2026 Republican primary with roughly 69.76% of the vote [6]. He is set to face Democratic nominee N'Kiyla Jasmine Thomas in the general election on November 3, 2026 [8][9][10]. Expert-curated and public forecasting data currently identifies no specific campaign missteps or significant competitive threats that would challenge his strong position, leading the market to treat the race as a near-certain Republican victory [4][1].
Despite his strong position, future unforeseen events could challenge his lead. Potential catalysts that could affect Hern's frontrunner status include unforeseen negative disclosures or extreme shifts in the national political landscape [4].
Sources (10)
  1. 12026 Oklahoma US Senate Forecastvotes.decisiondeskhq.com
  2. 22026 Oklahoma US Senate Marketsvotes.decisiondeskhq.com
  3. 3OK Senate 2026 - Cook Political Reportcookpolitical.com
  4. 4Kevin Hern Odds: Oklahoma Senate Race 2026 on Kalshioddsshopper.com
  5. 5United States Senate election in Oklahoma, 2026 - Ballotpediaballotpedia.org
  6. 62026 Oklahoma US Senate | Live Election Resultsvotes.decisiondeskhq.com
  7. 7Kevin Hern: 2026 Oklahoma U.S. Senate Polls & Odds | Prediction Edgepredictionedge.com
  8. 8Hern wins GOP primary for Mullin's Senate seat in Oklahoma - The Hillthehill.com
  9. 9N'Kiyla Jasmine Thomas has won the Democratic runoff for the U.S....facebook.com
  10. 10Senate Race - News9.comnews9.com

9. What does historical election data in Oklahoma suggest about the viability of a progressive Democratic candidate against a Republican incumbent?

Republican Win Probability (2026 Senate)98% for Kevin Hern [1][2][3][4][5]
Democratic County Wins (Presidential)Zero counties since 2004 [4]
Republican Presidential Vote TrendConsistently since 2000 [6][7][8]
Oklahoma's political landscape heavily favors Republicans. The state is deeply conservative and Republican-dominated, with the Republican Party holding all federal and statewide offices and supermajorities in the state legislature [9]. Oklahoma has consistently voted for the Republican presidential candidate since 2000, presenting a significant hurdle for any progressive Democratic candidate [6][7][8]. The Democratic Party has notably struggled, failing to carry a single county in presidential elections since 2004 [4].
A progressive Democrat faces limited viability in the 2026 Senate election. Historical and current political data indicate extremely limited viability for a progressive Democratic candidate against Republican incumbents in Oklahoma's general elections [10]. For the 2026 U.S. Senate election, Republican candidate Kevin Hern is projected to win against Democratic candidate N'Kiyla Thomas, with a 98% win probability for Hern [1][2][3][4][5]. This projection is further supported by prediction markets, which overwhelmingly favor the Republican nominee, Kevin Hern, with odds reaching approximately 95-98% [11][12].
Sources (12)
  1. 12026 Oklahoma US Senate Forecastvotes.decisiondeskhq.com
  2. 22026 Oklahoma US Senate Forecastnewsnation-votes.decisiondeskhq.com
  3. 32026 Oklahoma US Senate Marketsvotes.decisiondeskhq.com
  4. 4United States Senate election in Oklahoma, 2026 - Ballotpediaballotpedia.org
  5. 52026 Oklahoma US Senate | Live Election Resultsvotes.decisiondeskhq.com
  6. 6Presidential voting trends in Oklahoma - Ballotpediaballotpedia.org
  7. 7Dave Leip's Atlas of U.S. Presidential Elections - Compare Graphsuselectionatlas.org
  8. 8Dave Leip's Atlas of U.S. Presidential Elections - Compare Graphsuselectionatlas.org
  9. 9Politics of Oklahoma - Wikipediaen.wikipedia.org
  10. 10She won the most votes in the Oklahoma Democratic Party for U.S....facebook.com
  11. 11Kevin Hern: 2026 Oklahoma U.S. Senate Polls & Odds | Prediction Edgepredictionedge.com
  12. 122026 Senate Races: All 35 Seats, Market by Marketpredictionmarketspicks.com

10. What Could Change the Odds

Key Catalysts

The 2026 U.S. Senate election in Oklahoma, scheduled for November 3, 2026, will fill the Class II seat [1][2][3]. This seat became vacant after Senator Markwayne Mullin resigned in March 2026 to become Secretary of Homeland Security; appointee Alan S. Armstrong is not seeking a full term [2][3][4]. Republican nominee Kevin Hern and Democratic nominee N'Kiyla Jasmine Thomas are the confirmed candidates for the general election [1][2][3][5][6][7]. No winner has been declared as of September 9, 2026 [1][8].
Prediction markets currently favor the Republican Party to retain overall control of the U.S. Senate in 2026 [9][10][11][12]. Market pricing shifts based on fundraising, primary outcomes, and national polling trends [9][10][11][12]. The Democratic primary occurred on June 16, 2026, with a subsequent runoff on August 25, 2026 [13][14][15]. Future market probability shifts will likely depend on general election campaign developments, including candidate fundraising and polling data, leading up to the November 3, 2026, general election [1][2][3][13][14][15].

Key Dates & Catalysts

  • Expiration: November 03, 2027
  • Closes: November 03, 2027
Sources (15)
  1. 1United States Senate election in Oklahoma, 2026 - Ballotpediaballotpedia.org
  2. 22026 United States Senate election in Oklahoma - Wikipediaen.wikipedia.org
  3. 3Oklahoma 2026 General Electionthegreenpapers.com
  4. 4Cheat sheet: 5 Oklahoma Democrats compete in U.S. Senate primarynondoc.com
  5. 52026 Oklahoma US Senate | Live Election Resultsvotes.decisiondeskhq.com
  6. 6United States Senate election in Oklahoma, 2026 (August 25...ballotpedia.org
  7. 7United States Senate election in Oklahoma, 2026 (June 16...ballotpedia.org
  8. 82026 Oklahoma US Senate | Live Election Resultsvotes.decisiondeskhq.com
  9. 9Which party will win the Senate in 2026? Predictions & Od... | Polymarketpolymarket.com
  10. 10Senate 2026 Odds: Live Prediction Market Tracker for Chamber Control – Bellwetherbellwether.market
  11. 112026 US Senate Control Odds & Analysis | Prediction Geniuspredictiongenius.io
  12. 122026 Live Midterms Forecasts by State | Kalshikalshi.com
  13. 132026 election and voting dates - Ballotpediaballotpedia.org
  14. 142026 Midterm Primary Election Calendar - The New York Timesnytimes.com
  15. 15The Downballot's 2026 election calendar - The Downballotthe-downballot.com