TOTAL VOLUME:
$134.2b
24H VOL:
$134,145,987
24H TRANSACTIONS:
2,388,728,490
OPEN INTEREST:
$1,441,166,947
406,422
Markets across
30,383
events
MATCHED EVENTS:
2,688
PLATFORM COVERAGE:
5
Polymarket:
39%
VS.
Kalshi:
61%
Closed: Sep 4, 12:26 AM EST
Polymarket
The 2026 U.S. general elections for Congress are scheduled to be held on November 3, 2026. This market will resolve according to the total number of Republican members of the U.S. Senate who are considered to be retiring or not seeking reelection in 2026. For the purposes of this market, a member may be considered not to seek reelection if: • They publicly announce they are retiring from Congress and will not run for reelection to their current seat • They choose to run for a different elected office in 2026 instead of running for reelection to their current seat • They do not seek their party’s nomination for reelection to their current seat, meaning they neither file for reelection nor participate in their party’s nominating process (such as a primary, convention, or caucus) Only members whose current term is scheduled to end with the 2026 regular election for the Senate may qualify for this market. This market will not resolve until after the relevant final 2026 candidate filing deadline has passed in all states, which is expected to occur in late August 2026. The resolution source for this market will be a consensus of credible reporting.
The 2026 U.S. general elections for Congress are scheduled to be held on November 3, 2026. This market will resolve according to the total number of Republican members of the U.S. Senate who are considered to be retiring or not seeking reelection in 2026. For the purposes of this market, a member may be considered not to seek reelection if: • They publicly announce they are retiring from Congress and will not run for reelection to their current seat • They choose to run for a different elected office in 2026 instead of running for reelection to their current seat • They do not seek their party’s nomination for reelection to their current seat, meaning they neither file for reelection nor participate in their party’s nominating process (such as a primary, convention, or caucus) Only members whose current term is scheduled to end with the 2026 regular election for the Senate may qualify for this market. This market will not resolve until after the relevant final 2026 candidate filing deadline has passed in all states, which is expected to occur in late August 2026. The resolution source for this market will be a consensus of credible reporting.
Prediction market odds on Polymarket reflect traders' collective expectations about Senate retirements, which often diverge from traditional polling. While polls measure voter sentiment or hypothetical preferences, prediction markets price in real-time signals from political insiders, fundraising data, and retirement announcements. Markets tend to update faster than polls when senators make unexpected retirement decisions. Comparing the two reveals whether traders are pricing in higher or lower retirement rates than public surveys suggest, offering insight into information asymmetries between political professionals and the general electorate.
The market resolves on Aug 31, 2026, after the 2026 election cycle concludes and final retirement data is confirmed. Resolution hinges on an official count of Republican Senators who did not run for reelection in 2026, including those who retired, pursued higher office, or were otherwise absent from the ballot. The outcome is determined by verified records from the U.S. Senate and election authorities, ensuring accuracy in the final tally used to settle all contracts.
Direct retirement announcements from sitting Republican Senators are the primary catalyst for price movement. Health crises, scandals, or electoral vulnerability in a senator's home state can trigger unexpected retirements. Broader political shifts—such as changes in party leadership, redistricting outcomes, or shifts in presidential approval—may also influence retirement decisions. Fundraising reports and primary challenges signal whether senators face serious reelection threats. Media coverage of potential retirements and insider reporting from political analysts can move odds as new information reaches traders, making this market highly responsive to real-time political developments.