20% — Will exactly 3 the Senate Republicans lose re-election in 2026
Kalshi 20% · 4 contracts · $50 volume · medium confidence
Updated 2026-08-10 07:34:32 UTC

Why this matters:
This probability represents the likelihood that exactly three Senate Republicans will fail to win re-election in 2026, neither more nor fewer. Currently at 16%, this reflects a scenario where Republicans face moderate but not severe headwinds. The current assessment appears anchored on competitive races in states like Maine (31¢ probability of GOP victory) and Ohio (very tight margins expected), while Republican strongholds like Wyoming and Kansas show strong incumbency advantages. The probability would rise if economic conditions deteriorate or presidential approval drops significantly, and would fall if Republicans consolidate support in currently contested races. The 2026 midterm election on November 3rd will definitively resolve this question, though Senate race dynamics will clarify substantially through summer polling and September primary results across key states.

Key factors:
- Maine Senate race competitiveness: GOP candidate probability at 31¢ suggests meaningful Democratic vulnerability in a traditionally competitive state
- Ohio margin expectations: Republican victory margin priced at only 6¢ for 4+ points indicates an extremely tight race in a key battleground
- Incumbent protection in safe states: Wyoming (85¢ for 30+ point margin) and Kansas (73¢ GOP win) show strong baseline Republican retention in non-competitive races
- Overall Senate control pricing at 50¢: Equal Republican-Democratic odds for chamber control suggest the electoral environment remains genuinely uncertain
- Specific threshold effect: Exactly three losses is a narrow band—more Democrats gaining seats would move the question into different territory

Contracts:
- Will at least 5 the Senate Republicans lose re-election in 2026?: 5 or more — 46¢ Kalshi $50 (weight 100%)
- Will exactly 2 the Senate Republicans lose re-election in 2026?: Exactly 2 — 3¢ Kalshi $0 (weight 0%)
- Will exactly 3 the Senate Republicans lose re-election in 2026?: Exactly 3 — 17¢ Kalshi $0 (weight 0%)
- Will exactly 4 the Senate Republicans lose re-election in 2026?: Exactly 4 — 14¢ Kalshi $0 (weight 0%)

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## Methodology

SimpleFunctions aggregates live YES-side prices from Kalshi and Polymarket contracts bound to this question. For binary topics the headline is the liquidity-weighted mid-price (weight = log(1 + 24h volume) × freshness, where freshness is 1.0 if updated <24h, 0.7 if <7d, 0.4 otherwise). For multi-outcome (winner-take-all) topics the headline is the current leader's price — disjoint outcomes are never arithmetically averaged. Snapshots refresh every 5 minutes during market hours.

## SF Signal

- SF Index, regime, and 30d Brier calibration are computed separately and surfaced at https://simplefunctions.dev/admin/calibration.
- No SimpleFunctions index / regime / calibration signal is bound to this topic yet — the headline above is market-derived only.

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*Last verified: 2026-08-10T07:20:51.114Z*

By SimpleFunctions — https://simplefunctions.dev/

Cite as: "20% per prediction markets (SimpleFunctions, August 2026)"
Canonical: https://simplefunctions.dev/answer/losereelectionrsen
Full data: https://simplefunctions.dev/api/public/query?q=Will%20exactly%203%20the%20Senate%20Republicans%20lose%20re-election%20in%202026
Provider: SimpleFunctions — https://simplefunctions.dev