TOTAL VOLUME:
$66b
24H VOL:
$398,877,831
24H TRANSACTIONS:
647,445,881
OPEN INTEREST:
$1,477,629,845
622,934
Markets across
14,083
events
MATCHED EVENTS:
1,257
PLATFORM COVERAGE:
4
Polymarket:
49%
VS.
Kalshi:
51%
2026 Balance of Power: D Senate, D House
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Intro
This market tracks which party will control the U.S. Senate and House of Representatives after the 2026 midterm elections. Aggregated across Polymarket and Predict, the leading outcome—Democrats controlling both chambers—stands at 43.2%, with Republicans controlling both chambers at 42.5%. Resolution will be determined by Associated Press, Fox News, and NBC consensus, or official certification if consensus is not reached. Watch the election results on November 3, 2026, when voters will determine the partisan balance of Congress for the next two years.
PredictionHero - Resolution Divergence Alerts (RDA)
Unified Resolution Criteria (Consistent across platforms)
Primary resolution logic:
Associated Press, Fox News, and NBC (all three must achieve consensus); official certification if consensus not reachedCore resolution logic:
- House control: party winning majority of voting seats
- Senate control: party with more than half of voting members, or exactly half with Vice President support
- Party affiliation: ballot-listed party or most recent expressed caucus intent at time of conclusive media call
- House ambiguity resolution: party affiliation of first Speaker elected after 2026 midterms
- Senate ambiguity resolution: party affiliation of first Majority Leader elected after 2026 midterms
- Independent or third-party candidates: classified by most recent caucus intent with Democrat or Republican parties
Edge cases & Clarifications:
- Tied or Ambiguous House Control: If seat count does not clearly establish majority, resolution defers to the party affiliation of the first Speaker of the House selected following the 2026 elections.
- Tied or Ambiguous Senate Control: If voting member count does not clearly establish control (including scenarios where VP tiebreaker role is disputed), resolution defers to the party affiliation of the first Majority Leader of the Senate selected following the 2026 elections.
- Independent or Third-Party Candidates: Candidates without ballot-listed Democrat or Republican affiliation are classified by the party they most recently expressed intent to caucus with at the time the elections are conclusively called by media sources.
- Media Source Disagreement: If Associated Press, Fox News, and NBC do not reach consensus on winners, resolution is determined by official state and federal certification processes.
- Other Outcome: Resolves if none of the four standard partisan combinations (RR, RD, DR, DD) occur, such as if a third party or independent gains decisive control of either chamber.
Timing:
Resolution occurs once all three media sources (AP, Fox News, NBC) have conclusively called winners of both House and Senate races in the 2026 U.S. midterm elections, or upon official certification if media consensus is not achieved. Expected timing: November 2026, with potential delays if races remain undecided.Polymarket
This market will resolve according to the result of the 2026 United States midterm elections. A party will be considered to have 'control' of the House of Representatives, if they win a majority of voting seats. A party will be considered to have 'control' of the Senate if they have more than half of the voting Senate members, or half of the voting Senate members and the Vice President. A candidate's party is determined by their ballot-listed or otherwise identifiable affiliation with that party at the time the 2026 United States midterm elections are conclusively called by this market's resolution sources. A candidate without a ballot-listed affiliation to either the Democrat or Republican Parties will be considered a member of one of these parties based on the party that they most recently expressed their intent to caucus with at the time the 2026 United States midterm elections are conclusively called by this market's resolution sources. If control of the House is ambiguous given the above rules, this market will resolve according to the party affiliation of the first Speaker of the US House who is selected following the 2026 United States midterm elections. If control of the Senate is ambiguous given the above rules, this market will resolve according to the party affiliation of the first Majority Leader of the US Senate who is selected following the 2026 United States midterm elections. The resolution source for this market is the Associated Press, Fox News, and NBC. This market will resolve once all three sources have conclusively called winners of the House and Senate in the 2026 United States midterm elections. If all three sources do not achieve consensus in calling the relevant races for this market, it will resolve based on the official certification.
Predict
This market will resolve according to the result of the 2026 United States midterm elections. A party will be considered to have 'control' of the House of Representatives, if they win a majority of voting seats. A party will be considered to have 'control' of the Senate if they have more than half of the voting Senate members, or half of the voting Senate members and the Vice President. A candidate's party is determined by their ballot-listed or otherwise identifiable affiliation with that party at the time the 2026 United States midterm elections are conclusively called by this market's resolution sources. A candidate without a ballot-listed affiliation to either the Democrat or Republican Parties will be considered a member of one of these parties based on the party that they most recently expressed their intent to caucus with at the time the 2026 United States midterm elections are conclusively called by this market's resolution sources. If control of the House is ambiguous given the above rules, this market will resolve according to the party affiliation of the first Speaker of the US House who is selected following the 2026 United States midterm elections. If control of the Senate is ambiguous given the above rules, this market will resolve according to the party affiliation of the first Majority Leader of the US Senate who is selected following the 2026 United States midterm elections. The resolution source for this market is the Associated Press, Fox News, and NBC. This market will resolve once all three sources have conclusively called winners of the House and Senate in the 2026 United States midterm elections. If all three sources do not achieve consensus in calling the relevant races for this market, it will resolve based on the official certification
Frequently asked questions
Prediction markets incorporate not only current polling data but also trader expectations about future shifts in voter sentiment, campaign dynamics, and economic conditions. While traditional polls capture a snapshot of voter preference at a single moment, markets reflect real-money bets on actual outcomes, incentivizing accuracy. The Balance of Power: 2026 Midterms markets may diverge from polls when traders anticipate momentum changes, turnout variations, or unforeseen political events. Comparing market odds to polling averages helps identify where professional forecasters and the betting public expect the most significant movement before Nov 3, 2026.
Polymarket and Predict can show different implied probabilities for the same outcome because of liquidity, fee structure, participant mix, and how each venue defines the contract. Each platform attracts different trader demographics, liquidity pools, and fee structures, which can cause price discrepancies even for identical outcomes. Polymarket currently shows 42.5% for its top outcome, while Predict reflects 0.7%, a spread of 41.8 percentage points. These differences arise from variations in user base composition, trading volume concentration, and how quickly each platform's order book responds to breaking political news. Savvy traders monitor both platforms to identify arbitrage opportunities and to understand which market segment is more bullish or bearish on specific midterm scenarios.
The market resolves on Nov 3, 2026, following the 2026 U.S. midterm elections. Resolution is determined by the official results of Senate and House races nationwide. The outcome will reflect which party holds a majority in each chamber after all votes are counted and certified. Traders should monitor state-by-state races, special elections, and any procedural developments that could affect final seat counts. The market's resolution hinges on the actual composition of Congress as confirmed by official election authorities.
Major catalysts include economic data releases, approval ratings, legislative victories or defeats, scandals affecting key candidates, and shifts in voter enthusiasm. Midterm-specific events such as candidate announcements, primary results, and debate performances will influence trader sentiment. International crises, inflation trends, and employment figures often reshape the political landscape heading into midterms. Campaign spending, voter registration drives, and turnout models will also drive market repricing. Additionally, special elections and redistricting outcomes in key states may signal momentum shifts that traders will rapidly incorporate into odds before Nov 3, 2026.
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