Closest Senate race in 2026
Short Answer
1. Market Behavior & Drivers
- Since last update (~184d): Headline model and market probabilities rose +13.4pp; Kansas and seven new outcomes were added.
- Georgia's model probability fell -13.2pp (model_led), with the edge compressing against the market.
- Iowa's model probability rose +7.6pp (model_led), widening the edge over the market.
- Confidence score decreased -1.0pp, while Texas saw a market_led drop of -10.5pp.
- Kansas and Iowa have sub-1-point polling averages, leading Polymarket for the closest race. Texas shows a statistical tie in recent polls, with reported 0-2 point margins.
Who Wins and Why
| Outcome | Market | Model | Why |
|---|---|---|---|
| Kansas | 15.0% | 15.2% | Kansas leads prediction market pricing for the closest race and has a tight polling average. |
| Texas | 9.5% | 9.4% | Recent polling indicates a statistical tie in Texas, which Cook rates as a Toss-up. |
| Michigan | 8.7% | 7.5% | Michigan is rated a Toss-up by Cook, indicating a competitive race. |
| Iowa | 14.0% | 16.1% | Iowa's polling average shows a very tight margin, and it is a leading contender in prediction markets. |
| Alaska | 7.9% | 5.9% | Alaska is rated a Toss-up by Cook Political Report. |
Current Context
Sources (15)
- 1Closest Senate Race?polymarket.com
- 2Senate Prediction Markets & Live Odds 2026polymarket.com
- 3Senate races · Election Forecast Trackerkevinmdeluca.com
- 42026 battleground: the closest races and the latest pollspollingforecast.com
- 5Cillizza's midterm metrics: The Senate odds, 7 days outnews.kalshi.com
- 62026 United States Senate electionsen.wikipedia.org
- 7United States Senate elections, 2026 - Ballotpediaballotpedia.org
- 8U.S. Senate Elections: 2026 Ballot & Results for Every Cycle Since 1990senatordb.com
- 92026 CPR Senate Race ratings | Cook Political Reportcookpolitical.com
- 102026 Senate Archives - Sabato's Crystal Ballcenterforpolitics.org
- 11Tracking Competitive Races in the House and Senatenytimes.com
- 12The races that will decide control of the US Senatereuters.com
- 13Latest Polls In 2026 Midterms: Democrats Lead In Texas...forbes.com
- 142026 Midterm Election Predictions & Odds: Live Senate, House & Governor Forecasts | Kalshikalshi.com
- 152026 Senate Races: All 35 Seats, Market by Marketpredictionmarketspicks.com
2. Price Chart
Historical Price (Probability)
3. Market Data
Contract Snapshot
The provided page content does not detail the specific criteria that define the "closest Senate race" for a YES resolution, nor the conditions for a NO resolution. Each market (e.g., Kansas, Iowa, Texas) would resolve YES if its respective Senate race is determined to be the closest, and NO otherwise. The latest date for market resolution and payout is January 2, 2027. No special settlement conditions are outlined in the provided content.
Available Contracts
Market options and current pricing
| Outcome bucket | Yes (price) | No (price) | Last trade probability |
|---|---|---|---|
| Kansas | $0.15 | $0.86 | 15% |
| Iowa | $0.14 | $0.87 | 14% |
| Texas | $0.10 | $0.91 | 10% |
| Maine | $0.09 | $0.91 | 9% |
| Michigan | $0.09 | $0.92 | 9% |
| Ohio | $0.07 | $0.93 | 8% |
| South Carolina | $0.08 | $0.93 | 8% |
| Alaska | $0.08 | $0.93 | 8% |
| Nebraska | $0.07 | $0.93 | 7% |
| Florida | $0.04 | $0.97 | 4% |
| Mississippi | $0.04 | $0.97 | 4% |
| Montana | $0.04 | $0.99 | 3% |
| New Hampshire | $0.02 | $0.99 | 2% |
| Minnesota | $0.02 | $0.99 | 2% |
| Arkansas | $0.01 | $1.00 | 1% |
| Idaho | $0.01 | $1.00 | 1% |
| Louisiana | $0.01 | $1.00 | 1% |
| South Dakota | $0.01 | $1.00 | 1% |
| Georgia | $0.01 | $1.00 | 0% |
| North Carolina | $0.00 | $1.00 | 0% |
Market Discussion
As of October 30, 2026, prediction markets indicate a photo finish between Kansas and Iowa for the closest Senate race [1][2][3][4]. While Kansas leads Polymarket at 15% to Iowa's 14%, Kalshi's data, including an October 27 snapshot, shows these states essentially tied [1][2][3][4]. Substantive analysis from sources like Sabato’s Crystal Ball also identifies both Iowa and Kansas as Toss-up races with basically tied polling, with Texas and Maine frequently cited as other competitive battlegrounds [4][5][6][7][8].
Sources (8)
- 1Closest Senate Race?polymarket.com
- 2Senate Elections Prediction Markets & Odds | Kalshikalshi.com
- 3Closest Senate race in 2026? Kalshi Odds: Iowa 16% | Kalshi Viewkalshiview.com
- 4Cillizza's midterm metrics: The Senate odds, 7 days outnews.kalshi.com
- 5Closer Senate Race: Iowa or Maine?polymarket.com
- 6The Six Senate Races That Will Decide the Majoritynase.org
- 7Five Senate Rating Changes as Close Battle for Majority Control Rages - Sabato's Crystal Ballcenterforpolitics.org
- 8Competitive 2026 Senate Races & Battlegrounds | Nijinnmidterms.nijinn.io
4. Trust Index
Largest single print on KXCLOSESTSENATE-27JAN03-MS carried 56% of its $10,136 tape (window is 69% of 24h flow)
Integrity risk· Large trades
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
5. What polling data and expert ratings from Q3-Q4 2026 support the consensus that Kansas and Iowa are the top contenders for the closest race?
| Kansas Poll Margin | 1.4 points (Hamilton 46.7% vs Marshall 45.3%) [1] |
|---|---|
| Iowa Poll Margin | 0.6 points (Hinson 45.8% vs Turek 45.2%) [2] |
| Expert Rating Q4 2026 | Iowa and Kansas rated Toss Up (Cook Political Report, October 20) [3] |
Sources (9)
- 1Kansas Senate Polls 2026: Marshall vs Hamiltonpollcheck.co.uk
- 22026 Polls: Iowa Senate270towin.com
- 32026 CPR Senate Race ratingscookpolitical.com
- 4United States Senate election in Kansas, 2026ballotpedia.org
- 5November 3, 2026: Closest Senate race in 2026 Prediction Marketrobinhood.com
- 6Closest Senate race in 2026? Kalshi Odds: Iowa 16% | Kalshi Viewkalshiview.com
- 72026 Senate Battleground Polls: Midterm Primary Trendsnbcnews.com
- 8Closest Senate race in 2026? - Compare Odds on 3 Platforms | CoinRithmcoinrithm.com
- 9Closest Senate race in 2026 odds: Iowa 16% on Kalshipredictdesks.com
6. How do the campaign finance landscapes in the Texas and Ohio Senate races compare for the 2026 cycle, particularly regarding outside spending and grassroots fundraising?
| Texas Talarico Q3 Fundraising | $64 million with 97% under $100 (Q3 2026) [1][2][3] |
|---|---|
| Texas Pro-Paxton Outside Spending | Over $175 million after September 1 [4] |
| Ohio Late-October Ad Spending Total | About $496 million [5][6] |
Sources (12)
- 1James Talarico says raised Q3 record $64 million in Texas...cnbc.com
- 2James Talarico raises record $64 million in third quartertexastribune.org
- 3Democrat James Talarico targets Elon Musk at rallytheguardian.com
- 4Republicans bet Musk's millions can rescue Texas' Paxton...reuters.com
- 5Breaking Down Ad Spending for the 2026 Electionsnytimes.com
- 6The races that will decide control of the US Senatereuters.com
- 7Brown outraises Husted as outside groups enter Ohio's...ohiocapitaljournal.com
- 8Brown outraises Husted in final fundraising reportsspectrumnews1.com
- 9The Money Race Shaping Ohio's 2026 Senate Electionlegis1.com
- 10Closest Senate race in 2026? — Before Ja… — Odds & Prediction | Predictions.iopredictions.io
- 11Closest Senate race in 2026? Kalshi Odds: Iowa 16% | Kalshi Viewkalshiview.com
- 12Closest Senate race in 2026 | Kalshi Odds | EVDESKevdesk.ai
7. What potential 'October surprise' scenarios or national political shifts could most significantly tighten the vote margins in key states like Maine and Michigan before the November 2026 election?
| Maine Senate Race Poll (Jackson vs. Collins) | Jackson 49%, Collins 45% (October 30, 2026 polls) [1][2][3][4] |
|---|---|
| Michigan Race Poll (El-Sayed vs. Rogers) | El-Sayed 49%, Rogers 42% (October 30, 2026 polls) [1][2][5] |
| Potential October Surprise Impact | Could disrupt late-stage polling and momentum, impacting vote margins [6] |
Sources (6)
- 1Latest Polls In 2026 Midterms: Democrats Lead In Texas...forbes.com
- 2CNN poll shows Democrats leading in Michigan and Texas...foxnews.com
- 3Jackson, Collins separated by 2 points in Maine Senate...thehill.com
- 4Democrats in striking distance: New CNN polls in four...keyt.com
- 5Latest Polls In 2026 Midterms: Democrats Lead In...forbes.com
- 6Pre-Election Analysis for the 2026 Midtermsfiscalnote.com
8. Beyond polling, what do prediction market odds on Kalshi and other platforms suggest about the relative closeness of the races in Texas versus Alaska as of late October 2026?
| Probability Difference | Texas favored by 3-5 percentage points for narrowest race [1][2][3][4] |
|---|---|
| Kalshi Odds (Oct 29) | Texas about 10%, Alaska about 7% [1] |
| Polymarket Odds | Texas 11.5%-12%, Alaska 6.3%-7% [2][4][5] |
Sources (7)
- 1Closest Senate race in 2026 | Kalshi Odds | EVDESKevdesk.ai
- 2Closest Senate race in 2026? | PredictPediapredictpedia.com
- 3Polynode Exploreexplore.polynode.dev
- 4Closest Senate Race? — Polymarket odds | Polymtradepolym.trade
- 5Closest Senate Race? | PredictPediapredictpedia.com
- 6Closest Senate race in 2026? — live odds on Kalshi · OddsOnAiroddsonair.live
- 7Closest Senate race in 2026? Kalshi Odds: Iowa 16% | Kalshi Viewkalshiview.com
9. How do the state-specific laws for vote counting, certification deadlines, and automatic recounts in Georgia and North Carolina compare, and how might they impact the final certified margin in a razor-thin race?
| Georgia Recount Threshold | 0.5% or less (candidate-triggered) [1] |
|---|---|
| North Carolina Recount Threshold | Lesser of 0.5% or 10,000 votes (candidate-triggered) [2] |
| Georgia Statewide Certification | 17 days after the election [3] |
Sources (8)
- 1Election Recount Rules in Georgiageorgia.gov
- 2The Recount Process in North Carolina Explainedncsbe.gov
- 3How Georgia Votes: Explaining certifications and recountseastcobbnews.com
- 4Election Results, Canvass, and Certificationeac.gov
- 5Georgia Code § 21-2-493 (2025) - Computation, canvassing, and tabulation of returns; investigation of discrepancies in vote counts; recount procedure; posting of digital images of scanned paper ballots; certification of returns; change in returns:: 2025 Georgia Code:: U.S. Codes and Statutes:: U.S. Law:: Justialaw.justia.com
- 6State Election Canvassing Timeframes and Recount...nass.org
- 7Election Certification Deadlinesncsl.org
- 8Recounts — MultiState Electionsmultistate.us
10. What Could Change the Odds
Key Catalysts
Key Dates & Catalysts
- Expiration: January 10, 2027
- Closes: January 03, 2027
Sources (10)
- 1Latest Polls 2026, 2028 | RealClearPollingrealclearpolling.com
- 2TSU Texas senate poll shows Talarico narrowly ahead of Paxtonusatoday.com
- 3Democrats in striking distance: New CNN polls in four...cnn.com
- 42026 U.S. Senate Forecast | DDHQvotes.decisiondeskhq.com
- 5Senate Elections Prediction Markets & Odds | Kalshikalshi.com
- 62026 Senate Battleground Polls: Midterm Primary Trendsnbcnews.com
- 7Midterms: Congress Balance of Power?kalshi.com
- 82026 Live Midterms Forecasts by State | Kalshikalshi.com
- 9The Six Senate Races That Will Decide the Majoritynase.org
- 10Senate Combo: Texas, Michigan, Maine: Dems sweep 49% | PolyZigpolyzig.com