Short Answer

The Democratic party is expected to win the Delaware Senate race in 2026, with the market pricing this outcome at 98.9%.

1. Market Behavior & Drivers

This market, pricing the probability of a Republican winning Delaware's 2026 Senate election, saw its most significant move on September 9. The contract price dropped from 3.4% to 1.0% on the day early voting began for the state's primary. This timing suggests the start of voting focused attention on the race's underlying dynamics, which heavily favor a Democratic victory.
The market has consistently priced in a low probability for a Republican win, never rising above 3.4%. Total traded volume is low at 694 contracts. This minimal activity and narrow trading range reflect a consensus view that the election is not competitive. No other reported developments coincide with price movements.
  • Since last update (~28d): The Democratic party's model probability increased +1.9pp, with its edge flipping model_led.
  • Our confidence score significantly improved by +4.0pp, now standing at 9.0.
  • The overall prediction edge compressed to -0.4pp, a shift of -0.4pp.
  • Republican party market probability decreased -1.5pp, tracking a model drop.
  • Democrats are likely to win; incumbent Chris Coons holds a significant financial advantage. Major forecasters rate the race "Safe Democratic," reflecting Delaware's historical lean.

Who Wins and Why

Outcome Market Model Why
Republican party 1.0% 0.6% Republicans face significant structural challenges in statewide Delaware elections and a strong Democratic incumbent.
Democratic party 98.9% 99.4% Delaware has a strong historical Democratic lean, and major forecasters rate the race as "Safe Democratic."

Current Context

The 2026 Delaware Senate race heavily favors a Democratic victory. The general election is scheduled for November 3, 2026, following a primary election on September 15, 2026, with early voting underway as of September 9, 2026 [1][2][3][4][5][6]. Prediction markets and forecasting models widely rate the race as "Safe Democratic" or "Solid Democratic," indicating an extremely high probability of a Democratic win (>95%) [4][5][7]. Decision Desk HQ, as of September 4, 2026, forecasts a 99% probability of a Democratic victory with a projected vote margin of D+25 [4].
Incumbent Senator Coons maintains a significant financial advantage over challengers. Chris Coons (D) is seeking re-election for the Class II Senate seat [5][8][9]. His Democratic primary challengers include Jeff Appelhans, E. No-Trump Hansen, Mary Louve [1][3][10], and Christopher Beardsley [5][8]. Republican primary candidates are Michael "Dr. Mike" Katz and John Shulli [1][3][11][5][9]. As of mid-2026, Coons held a substantial financial lead, having raised approximately $6.67 million by June 30, 2026, significantly more than his primary and likely general election opponents [4].
Sources (11)
  1. 1Delaware Primary Voting Underway as Coons, Jennings Face Challengersshorenewsnetwork.com
  2. 22026 United States Senate election in Delaware - Wikipediaen.wikipedia.org
  3. 3Primary Election 9/15/2026 - Delaware Department of Electionselections.delaware.gov
  4. 42026 Delaware US Senate Forecastvotes.decisiondeskhq.com
  5. 5United States Senate election in Delaware, 2026 - Ballotpediaballotpedia.org
  6. 6Delaware election calendar - Ballotpediaballotpedia.org
  7. 7Delaware — U.S. Senate — 2026 forecast — Akashicakashic.app
  8. 8United States Senate election in Delaware, 2026 (September 15 Democratic primary) - Ballotpediaballotpedia.org
  9. 9United States Senate election in Delaware, 2026 (September 15...ballotpedia.org
  10. 10DE election 2026: Democratic primary voter guide for Senate - WHYYwhyy.org
  11. 11DE election 2026: US Senate Republican primary voter guide - WHYYwhyy.org

2. Price Chart

Historical Price (Probability)

Outcome probability
Date

3. Market Data

Contract Snapshot

This Kalshi market, "Delaware Senate winner?", resolves based on the party that wins the Delaware Senate election. A 'YES' resolution for a specific party's contract occurs if that party wins the race, and a 'NO' resolution occurs if they do not. Trading for this market begins on November 3, 8:00 AM EST, and the maximum payout date is set for November 3, 2027.

Available Contracts

Market options and current pricing

Outcome bucket Yes (price) No (price) Last trade probability
Democratic party $0.99 $0.04 99%
Republican party $0.04 $0.99 1%

Market Discussion

The 2026 Delaware U.S. Senate election has not yet occurred, with primary elections scheduled for September 15, 2026, and the general election for November 3, 2026 [1][2]. Incumbent Democratic Senator Chris Coons is seeking re-election and is widely considered the heavy favorite, with non-partisan forecasters rating the race as Safe or Solid Democratic [1][3][4][2]. Prediction markets largely reflect this sentiment, showing a strong consensus for a Democratic victory with implied probabilities typically ranging between 93% and 98% [5][6][7][8][9].

Sources (9)
  1. 12026 United States Senate election in Delaware - Wikipediaen.wikipedia.org
  2. 2United States Senate election in Delaware, 2026 - Ballotpediaballotpedia.org
  3. 32026 Delaware US Senate Forecastvotes.decisiondeskhq.com
  4. 4Delaware — U.S. Senate — 2026 forecast — Akashicakashic.app
  5. 52026 Delaware Senate race — polls, candidates & voter guide — IJRijr.com
  6. 6Delaware Senate winner? Odds & Predictions 2026 - Kalshikalshi.com
  7. 7Delaware Senate Election Winner Predictions & Odds 2026 | Polymarketpolymarket.com
  8. 82026 Delaware Elections, Odds & Candidates | Prediction Edgepredictionedge.com
  9. 9Will a Democrat Win the Delaware Senate Election? Winner Odds | Lines.comlines.com

4. Trust Index

This scorecard was computed Sep 26, 2026 and may not reflect current market conditions.

Octagon Trust Index Kalshi 74 Good

Order book is critically thin.

Primary risk· Trade quality

How it adds up
Integrity80% of score82Good
Trade quality20% of score42High Risk

Includes the cost to trade: a $1,000 order can't be filled here because the order book is too thin.

Trust score74Good

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
78Good

Outcome is hard to influence

Large tradesTrade signals · medium confidence

Largest single print on SENATEDE-26-D carried 40% of its $4,974 tape (print is 7d old)

Screened clean
Thin-volume movesNo significant move Clear
Size patternsNo distribution read 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
49Thin

Expect slippage beyond small size

2 contracts · worst first

Republican party4
Very thin · low confidence

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

Democratic party54
Thin · low confidence

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

Move quality
70Stable

No significant moves

2 contracts · worst first

Democratic party—
No significant move (3d)

Price was stable over the last 3 days.

Republican party—
No significant move (24h)

Price was stable over the last 24 hours.

Rule clarity
100Clear

Counts toward Resolution quality, not here

2 contracts · worst first

Democratic party100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Republican party100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Trade quality
42High Risk

Order book is critically thin

Tradable, but expect execution cost beyond small sizes.

Outcome quality 52 (notional-weighted across 2 scored legs)

$100 order: 0.3c slippage (~25% of a 1.2c contract)

$1,000 order: book too thin to fill

$10,000 order: book too thin to fill

Democratic party54Market scoreLiquidity54Move quality–Rule clarity100
Why 54
Liquidity
54 · Thin · low confidence

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

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
Republican party4Market scoreLiquidity4Move quality–Rule clarity100
Why 4
Liquidity
4 · Very thin · low confidence

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

Move quality
No significant move (24h)

Price was stable over the last 24 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. What do historical voting patterns and recent polling data indicate for the Democratic party's margin of victory in the 2026 Delaware Senate general election?

Projected Democratic MarginD+25 (Decision Desk HQ, Sept 9, 2026) [1][2]
Probability of Democratic Victory99% (Decision Desk HQ, Sept 9, 2026) [1][2]
Incumbent Chris Coons Funds Raised$6,669,194 (FEC, June 30, 2026) [1][2]
The 2026 Delaware Senate election heavily favors a Democratic victory, according to recent projections and polling data. As of September 9, 2026, Decision Desk HQ forecasts a Democratic win by a margin of D+25 with a 99% probability [1][2]. This projection aligns with a strong consensus among major election analysts and prediction markets, which consistently classify the race as 'Safe Democratic' or 'Solid Democratic', assigning the Democratic party a 96% to 98% chance of winning [3][4][5][6][7].
Delaware has a strong historical precedent of electing Democratic U.S. Senators, with Republicans not securing a victory in the state since 1994 [6][7]. Democratic candidates have consistently won recent U.S. Senate elections between 2012 and 2024 by significant margins, ranging from approximately 13 to 37 percentage points [6][7]. The incumbent Democrat, Chris Coons, is seeking his fourth term in the election scheduled for November 3, 2026, following a primary election on September 15, 2026 [6][7][8].
Incumbent Chris Coons holds a substantial financial advantage over his primary challenger. According to FEC data as of June 30, 2026, Coons has raised $6,669,194 [1][2]. In stark contrast, his identified primary challenger, John Shulli, has raised $105,295 during the same period [1][2].
Sources (8)
  1. 12026 Delaware US Senate Forecastvotes.decisiondeskhq.com
  2. 22026 Delaware US Senate Forecast | DDHQnewsnation-votes.decisiondeskhq.com
  3. 3Senate Election Odds | ElectionOddselectionodds.live
  4. 4Senate Markets - US Political Oddsuspoliticalodds.com
  5. 52026 Senate Races: All 35 Seats, Market by Marketpredictionmarketspicks.com
  6. 6United States Senate election in Delaware, 2026 - Ballotpediaballotpedia.org
  7. 72026 United States Senate election in Delaware - Wikipediaen.wikipedia.org
  8. 8United States Senate election in Delaware, 2026 (September 15...ballotpedia.org

6. What specific political developments or candidate-specific events between the September 2026 primary and the November general election could significantly narrow the forecasted outcome for Chris Coons?

Coons Win Probability96-98% (prediction markets) [1][2][3][4]
Election RatingSafe or Solid Democratic (major political forecasters) [1][2][3][4]
Last Republican Senator from Delaware1994 [1][2][3][5]
No specific events are currently identified to significantly narrow Coons' lead. Between the September 15, 2026 primary and the November 3, 2026 general election, no specific political developments or candidate-specific events are identified as likely to significantly narrow the forecasted outcome for incumbent Senator Chris Coons [1][2][3][5][6].
Senator Chris Coons is strongly favored for 2026 re-election. He is the incumbent Senator in the 2026 Delaware U.S. Senate election, and major political forecasters rate the race as either Safe or Solid Democratic, with prediction markets estimating his win probability at approximately 96-98% [1][2][3][4]. Delaware has a consistent Democratic lean, having not elected a Republican to the U.S. Senate since 1994 [1][2][3][5].
Coons' primary and general election races are not competitive. While Coons faces Democratic primary challengers, including Jeff Appelhans and E. No-Trump Hansen, and general election candidates such as Dexter Bland and Travis Stevens, his primary battle is not considered competitive due to his incumbency and established support [1][7][8][9].
Sources (9)
  1. 1United States Senate election in Delaware, 2026 - Ballotpediaballotpedia.org
  2. 2DE Senate 2026 - Cook Political Reportcookpolitical.com
  3. 32026 United States Senate election in Delaware - Wikipediaen.wikipedia.org
  4. 4Delaware Senate winner? Odds & Predictions 2026 - Kalshikalshi.com
  5. 5Delaware's Senate Election - VoteHubvotehub.com
  6. 6COONS, CHRISTOPHER A. - Candidate overview - FECfec.gov
  7. 7United States Senate election in Delaware, 2026 (September 15...ballotpedia.org
  8. 82026 Delaware US Senate Live Election Results | DDHQvotes.decisiondeskhq.com
  9. 9Primary Election 9/15/2026 - Delaware Department of Electionselections.delaware.gov

7. How does incumbent Chris Coons' fundraising and cash-on-hand compare to his Republican challengers, Michael Katz and John Shulli, according to the latest 2026 FEC filings?

Chris Coons Total Receipts$6,669,194 [1][2]
Chris Coons Cash-on-Hand$4,705,684 [1][2]
Predicted Democratic Victory96% to 99% [3][4][5][6][7]
Senator Chris Coons significantly out-raised his Republican challengers for 2026. As of the June 30, 2026, FEC reporting deadline, incumbent Democratic Senator Chris Coons reported robust fundraising for the 2026 Delaware Senate election. His campaign amassed $6,669,194 in total receipts and held a substantial $4,705,684 in cash-on-hand [1][2]. In contrast, his Republican primary opponents, John Shulli and Michael Katz, reported considerably lower financial figures. John Shulli's campaign had $105,295 in receipts and $46,113 in cash-on-hand, while Michael Katz's campaign reported $70,152 in receipts with $38,004 in cash-on-hand [8][1][2].
Prediction markets strongly favor a Democratic victory in the 2026 election. The significant financial disparity is reflected in current electoral forecasts. Prediction markets and forecasters overwhelmingly favor the Democratic candidate, with probabilities for a Democratic victory consistently ranging between 96% and 99% [3][4][5][6][7].
Sources (8)
  1. 1United States Senate election in Delaware, 2026 - Ballotpediaballotpedia.org
  2. 22026 United States Senate election in Delaware - Wikipediaen.wikipedia.org
  3. 3Delaware Senate winner? Odds & Predictions 2026 - Kalshikalshi.com
  4. 4Senate Markets - US Political Oddsuspoliticalodds.com
  5. 52026 Senate Races: All 35 Seats, Market by Marketpredictionmarketspicks.com
  6. 62026 Delaware US Senate Forecastvotes.decisiondeskhq.com
  7. 72026 Delaware US Senate Forecast | DDHQnewsnation-votes.decisiondeskhq.com
  8. 8United States Senate election in Delaware, 2026 (September 15...ballotpedia.org

8. How have race ratings from major non-partisan forecasters like Cook Political Report and Decision Desk HQ for the 2026 Delaware Senate race evolved throughout the election cycle?

Cook Political Report RatingSolid Democratic (as of September 1, 2026) [1]
Decision Desk HQ Probability99% Democratic victory (as of September 2026) [1][2]
Prediction Market Probability96-98% Democratic win (recent pricing) [3][4][5]
Non-partisan forecasters consistently project a strong Democratic advantage in Delaware's 2026 Senate race. Throughout the election cycle, major non-partisan forecasters, including the Cook Political Report and Decision Desk HQ, have consistently rated the 2026 Delaware U.S. Senate race in the Safe or Solid Democratic category. Incumbent Democratic Senator Chris Coons is running for re-election, and these ratings have demonstrated consistent stability, projecting a strong Democratic advantage as of September 2026 [1].
Specific forecasters show high probabilities for a Democratic victory in Delaware. As of September 1, 2026, the Cook Political Report has consistently rated the race as "Solid Democratic," while Decision Desk HQ has consistently rated it as "Safe Democratic" [1]. Decision Desk HQ's projections for September 2026 indicate a 98% to 99% probability for the Democratic candidate, maintaining an overall 99% probability of a Democratic victory [1][2][6][7]. Furthermore, prediction markets also overwhelmingly favor the Democratic candidate, with recent pricing suggesting a roughly 96-98% probability of a Democratic win [3][4][5].
Sources (7)
  1. 1United States Senate election in Delaware, 2026 - Ballotpediaballotpedia.org
  2. 22026 U.S. Senate Forecast - DDHQ Votes - Decision Desk HQvotes.decisiondeskhq.com
  3. 32026 Senate Races: All 35 Seats, Market by Marketpredictionmarketspicks.com
  4. 4Senate Markets - US Political Oddsuspoliticalodds.com
  5. 5Senate Election Odds | ElectionOddselectionodds.live
  6. 62026 Delaware US Senate Forecastvotes.decisiondeskhq.com
  7. 72026 Delaware US Senate Forecast | DDHQnewsnation-votes.decisiondeskhq.com

9. What challenges have Republican candidates faced in recent statewide Delaware elections, and how do these historical trends impact the viability of the GOP nominee in 2026?

Years without statewide GOP office12 years (as of 2026) [1]
Prediction market Dem victory probability96% to 99% (2026 Delaware Senate) [2][3][4][5]
Forecasting model Dem victory probability98-99% (2026 Delaware Senate) [6][7]
Republican candidates in Delaware face significant, long-standing structural disadvantages. These include a limited competitive presence in statewide races and inadequate resources, contributing to a prolonged Democratic stronghold [1][8][9]. Historically, Republicans have not held any statewide office in Delaware for the past 12 years [1]. Experts attribute these difficulties to a perceived lack of competitiveness, insufficient funding, and candidates opting to run independently of the party [1]. Delaware's political landscape is characterized by a Democratic trifecta and triplex, with no Republican statewide candidates securing election in recent cycles [8][9].
These historical challenges significantly undermine the GOP's viability in 2026. For example, in 2026, available reports show the Republican party did not contest any statewide office against Democrats for the first time in over a decade [1]. As of September 9, 2026, prediction markets overwhelmingly indicate a Democratic victory in the 2026 Delaware Senate race, with probabilities consistently estimated between 96% and 99% [2][3][4][5]. Furthermore, forecasting models from Decision Desk HQ classify the 2026 U.S. Senate election in Delaware as 'Safe Democratic,' projecting a 98-99% probability of victory for the Democratic candidate [6][7].
Sources (9)
  1. 1More than half of state races to be decided in September primariesspotlightdelaware.org
  2. 2Senate Markets - US Political Oddsuspoliticalodds.com
  3. 32026 DE-AL Winner by Party | Polls & Oddspredictionedge.com
  4. 4Senate Election Odds | ElectionOddselectionodds.live
  5. 52026 Senate Races: All 35 Seats, Market by Marketpredictionmarketspicks.com
  6. 62026 Delaware US Senate Forecast | DDHQvotes.decisiondeskhq.com
  7. 72026 Delaware US Senate Forecast | DDHQnewsnation-votes.decisiondeskhq.com
  8. 8Party control of Delaware state government - Ballotpediaballotpedia.org
  9. 9United States Senate election in Delaware, 2026 - Ballotpediaballotpedia.org

10. What Could Change the Odds

Key Catalysts

The 2026 Delaware U.S. Senate election is widely projected as Safe Democratic, with the primary scheduled for September 15, 2026, and the general election for November 3, 2026 [1][2][3][4]. Incumbent Senator Chris Coons (D) seeks a third full term, supported by a significant fundraising advantage, strong incumbency, and Delaware's consistent Democratic lean [5][6][7][1][8]. As of early September 2026, prediction markets and forecasting models assign Democratic candidates a win probability ranging from 96% to 99% [9][10][11][12]. Decision Desk HQ projects a D+25 margin and a 99% probability for Democrats [9].
Upside risks for Republican candidates Michael Katz and John Shulli, or independent Dexter Bland, are largely theoretical [5][6][1]. These include a major incumbent scandal, a surprise Coons withdrawal, or a dramatic national Republican wave [8]. As of September 9, 2026, the election has not occurred [1].

Key Dates & Catalysts

  • Expiration: November 03, 2027
  • Closes: November 03, 2027
Sources (12)
  1. 1United States Senate election in Delaware, 2026 - Ballotpediaballotpedia.org
  2. 2United States Senate election in Delaware, 2026 (September 15 Democratic primary) - Ballotpediaballotpedia.org
  3. 3United States Senate election in Delaware, 2026 (September 15...ballotpedia.org
  4. 4September 15, 2026, election results - Ballotpediaballotpedia.org
  5. 5Meet the candidates in Delaware's US Senate racedelawareonline.com
  6. 6Department of Elections - State of Delawareelections.delaware.gov
  7. 72026 United States Senate election in Delaware - Wikipediaen.wikipedia.org
  8. 8Will a Democrat Win the Delaware Senate Election?lines.com
  9. 92026 Delaware US Senate Forecastvotes.decisiondeskhq.com
  10. 10Delaware — U.S. Senate — 2026 forecast — Akashicakashic.app
  11. 112026 Delaware Senate Winner by Party | Polls & Oddspredictionedge.com
  12. 12Delaware Senate 2026 — Live Kalshi Oddspredictionmarketspicks.com