
Chart and changes show stored historical probabilities, not the selected live book.
Trends
Selected row: book midpoint. Other rows: stored references, possibly normalized; 24h changes use stored history.
Venue terms
Source: Polymarket
Informational venue terms only; CoinRithm paper trading uses its own rules.
Market depth · 4-6
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Book received (not venue quote time): —
Related Markets
Related questions for context, not a comparison of equivalent contracts.
How many Democratic House Incumbents will not win their Primary?
Republican House odds hit __ by October 31?
Republican House seats after the 2026 midterm elections?
Will Democrats win any of these ‘solid Republican’ house races?
Will Jim Jordan run for Republican House Leader?
Will a Republican House or Senate Candidate say Donald Trump should run for a third term before Midterms Election Day?
Rules
The 2026 midterm elections are scheduled to be held on November 3, 2026, with congressional primaries running from March through September.
Free JSON for this market, no API key needed:
https://api.coinrithm.com/api/prediction-markets/events/polymarket/how-many-republican-house-incumbents-will-not-win-their-primaryAI agents: call pm_data_event on the CoinRithm MCP server:
https://mcp.coinrithm.com/mcp+39 more outcomes
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