62% · $2.8M/day
Will Republicans control the Senate after 2026 midterms?
Highest-volume midterm market — GOP holds 53 seats
Politics Prediction Markets
US Senate 2026 — Can Democrats Retake the Majority?
Republicans hold 53 Senate seats entering the 2026 cycle. Democrats must run the table on a tough defensive map — Georgia, Arizona, Wisconsin, New Hampshire — while flipping at least one red seat. Prediction markets on Polymarket and Kalshi price Democratic Senate control at ~38%, with $2.8M+ in daily volume on the Georgia race alone.
Top Senate 2026 Prediction Markets
Cross-venue odds for US Senate control after the 2026 midterms. Prices as of June 2026 — click any market to compare across Polymarket, Kalshi, and PredictIt.
38% · $2.4M/day
Will Democrats retake the Senate majority in 2026?
Democrats need net +4 seats — historically difficult
55% · $680K/day
Will Democrats gain at least 2 Senate seats in 2026?
Partial gain threshold — more likely than full majority
48% · $340K/day
Will any GOP incumbent lose their Senate seat in 2026?
GOP incumbents up: Thom Tillis NC, others
Key 2026 Senate Races to Watch
Senate control in 2026 hinges on a handful of competitive races. These are the seats with the highest prediction market activity and most competitive polling.
Toss-up
Georgia — Jon Ossoff (D)
Most-watched race. Georgia has trended R since 2020, but Ossoff is well-funded and popular.
Lean D
Arizona — Mark Kelly (D)
Kelly's military background and moderate positioning have helped in a purple state.
Lean D
Wisconsin — Tammy Baldwin (D)
Wisconsin has become more competitive in presidential years but Baldwin runs strong.
Lean D
New Hampshire — Maggie Hassan (D)
NH trending purple. Hassan won 2022 narrowly. GOP recruitment key.
Lean R
North Carolina — Thom Tillis (R)
Tillis has faced intra-party tension. Most likely GOP-held seat Democrats could flip.
Lean D
Michigan — Gary Peters (D)
Peters not seeking re-election — open seat more competitive.
Why prediction markets for Senate races?
Real-money Senate consensus
Senate prediction markets aggregate real-money estimates from thousands of politically-informed traders. The Georgia Senate market on Polymarket has outperformed polling averages in recent cycles by incorporating early-vote data and fundraising signals faster than traditional forecasters.
Cross-venue Senate spread
Kalshi (CFTC-regulated) and Polymarket (global) often price Senate control 4–6 points apart, especially early in the cycle. PredictIt offers state-level race markets with lower position limits. Mantis shows all three in one search.
Combined House + Senate tracking
Senate and House control markets often move in opposite directions — a blue wave in one chamber doesn't guarantee the other. Mantis lets you monitor both simultaneously and see the full midterm picture across all venues.
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Full midterm overview — Senate, House, and key race prediction markets
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Full politics prediction market index
FAQ
What do prediction markets say about Senate control after 2026 midterms?
As of June 2026, prediction markets price Republican Senate retention at ~62% and Democratic takeover at ~38%. Republicans currently hold 53 seats, meaning Democrats need a net gain of 4 seats — historically difficult for a party targeting incumbents in their own unfavorable map. Georgia (Ossoff) is the most-watched race on Polymarket with $2.8M+ in daily volume.
Which 2026 Senate races have the most prediction market activity?
Georgia (Jon Ossoff) is the most-traded individual Senate race on Polymarket and Kalshi in 2026. Arizona (Mark Kelly) and Wisconsin (Tammy Baldwin) also have active individual markets. The overall Senate control contract — "Republicans retain Senate 2026" — is one of the highest-volume political markets on Polymarket.
How does the 2026 Senate map favour Republicans?
In 2026, Class 3 senators (elected in 2020) are up for re-election. Democrats are defending seats in swing states — Georgia, Arizona, Wisconsin, New Hampshire, Michigan — while Republicans have few vulnerable incumbents. This defensive map for Democrats is why prediction markets favour Republican Senate retention at ~62%.
How do Senate prediction market odds compare across Polymarket, Kalshi, and PredictIt?
Senate control markets often diverge across venues. Kalshi (CFTC-regulated) and Polymarket (global) each attract different trader bases and can be priced 3–5 points apart on the same Senate outcome. PredictIt covers individual state races with lower stakes. Mantis aggregates all venues so you always see the cross-venue consensus.