Short Answer

The model assigns meaningfully lower odds (36.4%) than the market (48.0%) for 'Will Democrats hold 235 or more seats in the House AND hold 51 or more seats in the Senate?'.

1. Market Behavior & Drivers

This market, "Blue tsunami in 2026?", exhibits a sideways, range-bound trading pattern. The price has been contained within a relatively narrow 11-point channel, oscillating between a low of 43.0% and a high of 54.0%. The current price of 48.0% sits near the midpoint of this range, indicating significant market indecision about the likelihood of a major Democratic victory in the 2026 midterm elections. While there was a notable spike to 52.0% in late April, the price quickly reverted back towards the middle of its trading range, failing to establish a new upward trend. This price action suggests a balanced sentiment among traders, with neither bulls nor bears able to sustain momentum and push the price out of its established channel.
With no specific news or external context provided, the direct cause for the price fluctuations, including the temporary spike, cannot be determined from the chart data alone. The total traded volume of 14,400 contracts suggests a moderate level of market engagement and capital commitment. However, without daily volume figures, it is difficult to ascertain whether specific price moves were driven by high-conviction trading or occurred in a low-liquidity environment. From a technical perspective, the 43.0% level has established itself as a firm support, while the 54.0% level has acted as consistent resistance. The market's inability to break and hold outside this range indicates that, for now, traders see the probability of this event as being confined to these boundaries.
  • President's party rarely gains 20+ House seats in midterms.
  • North Carolina's Republican-drawn map is approved for 2026 elections.
  • Republican-held Senate seats offer pickup opportunities due to retirements.
  • Campaign committees show varied financial strengths for 2026 elections.
  • Approximately 12 Republican House districts are vulnerable in 2026.

Who Wins and Why

Outcome Market Model Why
Will Democrats hold 235 or more seats in the House AND hold 51 or more seats in the Senate? 48.0% 36.4% Midterm elections typically favor the opposition party, making simultaneous large gains difficult.

2. Price Chart

Historical Price (Probability)

Outcome probability
Date

3. Market Data

Contract Snapshot

This market resolves to "Yes" if, after the 2026 midterms, Democrats hold 235 or more seats in the House AND 51 or more seats in the Senate. As a combination market, the entire contract resolves to "No" if any single component fails to occur or becomes impossible. Resolution is based on the composition of the U.S. House and Senate on February 1, 2027 (verified from official government sources, counting caucusing independents with their party), and the market closes by 10:00 AM EST on that date if not resolved earlier.

Available Contracts

Market options and current pricing

Outcome bucket Yes (price) No (price) Last trade probability
Will Democrats hold 235 or more seats in the House AND hold 51 or more seats in the Senate? $0.48 $0.55 48%

Market Discussion

Traders are divided on the likelihood of a 2026 "blue tsunami," with the market currently showing a low probability. Those betting "Yes" cite recent Democratic seat flips, a reported shift in Republican voter affiliation, and the perceived negative impact of Donald Trump. Conversely, "No" bettors express skepticism based on past predictions of "blue waves" that did not materialize, alongside general doubt.

4. Trust Index

This scorecard was computed Sep 22, 2026 and may not reflect current market conditions.

Octagon Trust Index Kalshi 90 Strong
How it adds up
Integrity80% of score94Strong
Trade quality20% of score76Good

Includes the cost to trade: a $10,000 order can't be filled here because the order book is too thin.

Trust score90Strong

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
94Strong

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 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
95Strong

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
84Deep

Size fills near the screen price

1 contract

Will Democrats hold 235 or more seats in the House AND hold 51 or more seats in the Senate?84
Deep · high confidence

Typical bar range 2.1% of price over 7 traded bars

24h traded notional $5,570 · 24h
Move quality
70Stable

No significant moves

1 contract

Will Democrats hold 235 or more seats in the House AND hold 51 or more seats in the Senate?—
No significant move (6h)

Price was stable over the last 6 hours.

Rule clarity
100Clear

Counts toward Resolution quality, not here

1 contract

Will Democrats hold 235 or more seats in the House AND hold 51 or more seats in the Senate?100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Trade quality
76Good

Order book supports trading

Deep and tight enough to trade efficiently.

Outcome quality 84 (notional-weighted)

$100 order: 0.5c slippage (~1% of a 47.5c contract)

$1,000 order: 1.0c slippage (~2% of a 47.5c contract)

$10,000 order: book too thin to fill

Will Democrats hold 235 or more seats in the House AND hold 51 or more seats in the Senate?84Market scoreLiquidity84Move quality–Rule clarity100
Why 84
Liquidity
84 · Deep · high confidence

Typical bar range 2.1% of price over 7 traded bars

24h traded notional $5,570 · 24h
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 22, 2026

5. Has Any President's Party Gained 20+ House Seats in Midterms?

Midterms with President's Party Losing House Seats20 of 21 midterms since 1946 [1], [2], [3], [4]
Midterms with President's Party Gaining House Seats1 (in 1998) [1], [5]
Largest House Seat Gain by President's Party5 seats (1998) [1], [5]
The president's party rarely gains House seats in midterm elections. Historically, the president's party has almost always lost seats in the House of Representatives during midterm elections, a pattern confirmed by data spanning from World War II onwards. Out of 21 midterms since 1946, the president's party lost House seats in 20 instances [1], [2], [3], [4]. Crucially, there is no record of the president's party achieving a gain of 20 or more House seats in any midterm election since World War II [5].
Only one midterm election saw the president's party gain seats. The sole exception to the trend of losing seats occurred in 1998, when President Bill Clinton's Democratic party gained 5 seats in the House [1], [5]. However, this gain falls significantly short of the 20 or more seat increase specified in the research question [1], [5].
The requested metrics cannot be determined for the specified scenario. Given that no midterm years since World War II have met the condition of the president's party gaining 20 or more House seats, it is not possible to calculate the average Real Clear Politics presidential approval rating in Q2 or the year-over-year change in the University of Michigan Consumer Sentiment Index for such a scenario.
Sources (5)
  1. 1Midterm Election Patterns: Why the President's Party Usually Loses | USPollingData.comuspollingdata.com
  2. 2Ripple by The Washington Postwashingtonpost.com
  3. 3For 80 years, the president’s party has almost always lost House seats in midterm elections, a pattern that makes the 2026 congressional outlook cleartheconversation.com
  4. 4For 80 years, the president’s party has almost always lost House seats in midterm elections, a pattern that makes the 2026 congressional outlook cleargcp.theconversation.com
  5. 5Seats in Congress Gained/Lost by the President's Party in Mid-Term Elections | The American Presidency Projectpresidency.ucsb.edu

6. What Congressional Map Rulings Affect 2026 Elections?

North Carolina Map StatusAllowed for 2026 elections, no pending rulings expected before filing [1]
Louisiana Map Ruling ExpectedBy June 2025 (Louisiana v. Callais) [2]
GA/FL Map Ruling InfoNot available in provided sources [3]
North Carolina's Republican-drawn congressional map is approved for 2026 elections. This map has received judicial approval for use in the 2026 election cycle, meaning no final rulings challenging it are scheduled before the candidate filing period [1]. Candidate filing for North Carolina's 2026 primary election is anticipated to begin in late 2025 or early 2026, with the congressional map already finalized [4].
Louisiana's congressional map faces a critical U.S. Supreme Court review. The U.S. Supreme Court is scheduled to hear arguments in Louisiana v. Callais, a case concerning the state's congressional map [3]. A decision is anticipated by June 2025 [2]. Should this ruling require modifications to the map, it would likely precede the candidate filing deadlines for the 2026 elections, which typically occur in late 2025 or early 2026 [5]. The existing map was utilized for the 2024 elections after the Supreme Court chose not to expedite an earlier ruling [6].
Information on other states and partisan impact is currently unavailable. The provided research does not include details on specific court cases challenging congressional maps in Georgia or Florida that have final rulings scheduled before the 2026 candidate filing deadlines. Furthermore, analyses from the Cook Political Report or Sabato's Crystal Ball concerning the projected net change in D+3 or better districts are not available in the supplied information.
Sources (6)
  1. 1Judges allow Republican-drawn NC congressional map to take effect for 2026newsobserver.com
  2. 2Redistricting ahead of the 2026 elections - Ballotpediaballotpedia.org
  3. 3Louisiana v. Callais (Callais v. Landry) | American Civil Liberties Unionaclu.org
  4. 4Candidate Filing Period | 2026 Primary Election | NCSBEncsbe.gov
  5. 5State and federal candidate filing deadlines for 2026 - Ballotpediaballotpedia.org
  6. 6Louisiana will use challenged congressional map after Supreme Court declines to expedite ruling | News From The Statesnewsfromthestates.com

7. What Republican-held Senate Seats Present Pickup Opportunities in 2026?

Mitch McConnell Re-election StatusWill not seek re-election [1]
Thom Tillis Re-election StatusWill not run again [2]
Thom Tillis Approval Rating25% [3]
Several Republican-held Senate seats offer significant pickup opportunities in 2026 due to retirements or low incumbent approval. Senators Mitch McConnell of Kentucky, Thom Tillis of North Carolina, and Susan Collins of Maine are identified as presenting top-tier opportunities, with Senator Lindsey Graham of South Carolina also facing high unfavorable views among voters [4]. Senator McConnell has publicly announced his decision not to seek re-election, creating an open seat in Kentucky [1]. Similarly, Senator Tillis has stated he will not run for the U.S. Senate again, signaling an open seat opportunity in North Carolina [2].
Beyond retirements, low approval ratings signal vulnerability for several incumbents. Senator Thom Tillis of North Carolina holds an approval rating of 25% within his state, falling below the 45% threshold often indicative of electoral vulnerability [3]. Senator Susan Collins of Maine has been identified as the second most unpopular senator nationally [4]. Additionally, a statewide poll in South Carolina reveals that a majority of potential voters view Senator Lindsey Graham unfavorably [5].
Sources (5)
  1. 1Sen. Mitch McConnell won't seek reelection in Kentucky in 2026 | AP Newsapnews.com
  2. 2Sen. Thom Tillis says he will not run again in ABC interview | Raleigh News & Observernewsobserver.com
  3. 3Thom Tillis has a 25% approval rating - Public Policy Pollingpublicpolicypolling.com
  4. 4New Poll: Susan Collins is Second Most Unpopular Senator in the Country | Maine Democratic Partymainedems.org
  5. 5Statewide poll shows majority of would-be voters view Sen. Graham unfavorablyabcnews4.com

8. How Have Congressional Campaign Committee Finances Shifted by Q1 2026?

DSCC Q1 2026 Cash-on-Hand Advantage$17.2 million over NRSC [1]
NRCC Q1 2026 Cash-on-Hand Advantage$19.7 million over DCCC [2]
DCCC Q1 2018 Cash-on-Hand Advantage$25.9 million over NRCC [3]
Democratic and Republican campaign committees show varied financial strengths for 2026. As of the end of Q1 2026 (March 31, 2026), the Democratic Senatorial Campaign Committee (DSCC) reported $62.3 million cash on hand, establishing a $17.2 million advantage over the National Republican Senatorial Committee (NRSC), which held $45.1 million [1]. In the House, however, the National Republican Congressional Committee (NRCC) ended the first quarter with $80.2 million cash on hand, surpassing the Democratic Congressional Campaign Committee (DCCC)'s $60.5 million, thereby securing a $19.7 million lead [2].
This financial position marks a significant reversal from the 2018 election cycle. At the close of Q1 2018, the NRSC had a $7.0 million advantage over the DSCC, with $27.3 million compared to the DSCC's $20.3 million [4], [5]. For House committees, the DCCC ended March 2018 with $60.4 million, holding a substantial $25.9 million lead over the NRCC's $34.5 million [3]. By Q1 2026, the DSCC successfully transformed its previous financial deficit into a $17.2 million lead, while the DCCC's former significant advantage shifted, with the NRCC now holding a $19.7 million lead [2].
Sources (5)
  1. 1Money in the 2026 midterms right now in 4 charts: NPRnpr.org
  2. 2🚨 NRCC Outraises DCCC, Extends Historic Money Streak - NRCCnrcc.org
  3. 3House Dem campaign arm has more money in bank than GOP counterpartdigital-release.thehill.com
  4. 4GOP coffers strong despite sluggish approvalopensecrets.org
  5. 5Senate GOP group raises $3.4 million to close 2017digital-dev.thehill.com

9. How Many Republican House Seats Are Vulnerable in 2026?

2026 'Toss-up' GOP House DistrictsApproximately 12 [1]
2026 'Most Vulnerable' GOP House Seats26 [2]
2026 Primary Activity OutlookSignificant activity anticipated [3]
The 2026 cycle shows competitive Republican House districts and anticipated primary challenges. Approximately 12 Republican-held House districts are currently rated as 'Toss-up', with a broader set of 26 GOP-held seats identified as "most vulnerable" [2]. While a definitive rate of announced primary challenges in these specific competitive districts is still emerging, the cycle is anticipated to feature significant primary activity, with potential for numerous incumbent primary defeats [3].
The 2022 cycle saw many primaries lead to general election underperformance. This outlook for 2026 contrasts with the 2022 cycle, where numerous Republican incumbents faced primary challengers [4]. In 2022, candidates who won highly contested or ideologically driven primary battles often subsequently demonstrated underperformance in the general election, impacting the Republican party's overall general election outcomes [4].
Sources (4)
  1. 1Cook Political House Ratings April 2026: 12 Toss-Up Seats, D Majority Path | USPollingData | USPollingData.comuspollingdata.com
  2. 22026 CPR House Race ratings | Cook Political Reportcookpolitical.com
  3. 3Republican Party battleground primaries, 2026 - Ballotpediaballotpedia.org
  4. 4Annual Congressional Competitiveness Report, 2022 - Ballotpediaballotpedia.org