Republican Senate seats after the 2026 midterm elections?
Leader sits at 28% across 7 bound outcomes, runner-up at 18%. This is a winner-take-all market — the headline is the leader’s price, not an arithmetic mean.
Leader probability
≤47
Outcomes
7
winner-take-all
Runner-up
18¢
51
Spread
10pp
contested
24h volume
$12K
liquid
Closes
—
not derived
Venue
Polymarket
7 bound
30-day trend
Bracket family
How the bracket ladder is priced.
Each row is one outcome on the venue. Sorted by 24h volume — the heaviest book is at the top.
Cluster 1
Republican Senate seats after the 2026 midterm elections
Republican Senate seats after the 2026 midterm elections?: 52
0x4b6d35…0486
Republican Senate seats after the 2026 midterm elections?: 53
0x812d9e…c1c2
Republican Senate seats after the 2026 midterm elections?: 51
0xf9b68b…456c
Republican Senate seats after the 2026 midterm elections?: ≤47
0x46c862…27a8
Republican Senate seats after the 2026 midterm elections?: 49
0x2fb2b4…ed56
Republican Senate seats after the 2026 midterm elections?: 50
0xa81e63…88fb
Republican Senate seats after the 2026 midterm elections?: 48
0xb2ce24…1253
Analysis
This prediction reflects a 24% chance that Republicans will hold 47 or fewer Senate seats after the 2026 midterm elections. Currently, Republicans control 53 seats, meaning this outcome requires Democrats to gain at least 6 seats. The probability reflects the structural challenge facing Democrats: the party typically defending many seats in favorable Republican terrain during midterms, combined with historical patterns of midterm losses for the party holding the presidency. Factors pushing this lower include strong Republican incumbents in key states and historical midterm dynamics. Factors that could raise it include significant political upheaval, economic deterioration, or unpopular legislative actions. The 2026 midterm elections on November 3, 2026, will definitively resolve this uncertainty. Between now and then, Senate-specific polling, approval ratings, and early candidate recruitment will signal shifting odds.
- ›Current Senate composition requires Democrats to flip 6 seats from Republican control to reach the ≤47 threshold, a substantial gain for a midterm
- ›The party holding the presidency typically faces headwinds in midterm elections, and historical patterns since 1950 show average losses of 3-4 Senate seats
- ›Demographic and electoral map advantages favor Republicans in 2026, with Democrats defending seats in multiple competitive or Republican-leaning states
- ›Early polling on individual Senate races and generic ballot performance will be primary signals for reassessing this probability through mid-2026
- ›Economic conditions, approval ratings of the sitting president, and major legislative developments between now and November 2026 will significantly influence final outcomes
Recently closed in election 2026
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- TX-18 Democratic Primary Winnerlast 89% · 3d
These markets stopped trading. Last odds and any captured outcome are shown above — full settlement detail lives at the venue.
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How we compute these odds
SimpleFunctions aggregates live prediction-market contracts from Kalshi and Polymarket. Each slug groups contracts that resolve on the same underlying event, identified by venue event_id.
For binary slugs, the headline probability is the liquidity-weighted mid-price across all bound contracts. For multi-outcome slugs (e.g. elections with 3+ candidates), the headline is the leader’s price; we never arithmetically average disjoint outcomes — that would produce a number with no real-world meaning.
Snapshots refresh every 5 minutes during market hours; daily aggregates are computed at 04:00 UTC. The 30-day sparkline is drawn from per-ticker daily means stored in market_indicator_daily; 24h delta and movement events are derived from the same source.
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