17% — Will the Democratic Party hold less than 45 seats in the 120th Congress Leader: Above 52 at 17% · Kalshi 17% · 19 contracts · $8K volume · medium confidence Updated 2026-07-24 00:13:52 UTC Tracks the leading outcome in a winner-take-all prediction market set with 19 outcomes. Why this matters: This probability reflects market participants' assessment that Democrats will hold fewer than 45 seats in the 120th Congress, which convenes in 2027. The current 17% price suggests markets view this outcome as unlikely but plausible. Democratic seat counts depend primarily on the 2026 midterm election results and any subsequent special elections or party switches before 2027. The market is currently pricing in more optimistic Democratic outcomes, with the leading contract (>52 seats) at 17%. The November 2026 midterm election will be the decisive catalyst, determining the overall Senate composition. Shifts in election forecasts, polling trends, and economic conditions heading into that vote would likely move these probabilities significantly. The wide spread across seat-count contracts (5¢ to 17¢) reflects genuine uncertainty about the final distribution. Key factors: - 2026 midterm election results in November will directly determine Senate composition and seat allocation between parties - Current market pricing shows higher probability mass at 49-52+ Democratic seats, implying baseline expectation of Democratic gains or stability rather than losses - Economic conditions, approval ratings, and campaign momentum between now and November 2026 will influence voter behavior and seat outcomes - Historical midterm patterns and special election dynamics could add or subtract seats between the general election and Congress convening in January 2027 - The 45-seat threshold represents roughly current Democratic strength; outcomes below this would require significant Democratic losses relative to today's baseline Contracts: - Will the Democratic Party hold more than 52 seats in the 120th Congress?: Above 52 — 17¢ Kalshi $3K (weight 32%) - Will the Democratic Party hold 50 seats in the 120th Congress?: 50 — 16¢ Kalshi $388 (weight 5%) - Will the Democratic Party hold 51 seats in the 120th Congress?: 51 — 15¢ Kalshi $2K (weight 21%) - Will the Democratic Party hold 49 seats in the 120th Congress?: 49 — 14¢ Kalshi $257 (weight 3%) - Will the Democratic Party hold 52 seats in the 120th Congress?: 52 — 10¢ Kalshi $899 (weight 11%) - Will the Democratic Party hold 48 seats in the 120th Congress?: 48 — 10¢ Kalshi $152 (weight 2%) - Will the Democratic party hold more than 56 Senate seats in the 121st Congress?: Above 56 — 10¢ Kalshi $0 (weight 0%) - Will the Democratic party hold fewer than 45 Senate seats in the 121st Congress?: Below 45 — 9¢ Kalshi $0 (weight 0%) - ... and 11 more --- ## 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. --- *Last verified: 2026-07-23T23:20:50.572Z* By SimpleFunctions — https://simplefunctions.dev/ Cite as: "17% per prediction markets (SimpleFunctions, July 2026)" Canonical: https://simplefunctions.dev/answer/dsenateseats Full data: https://simplefunctions.dev/api/public/query?q=Will%20the%20Democratic%20Party%20hold%20less%20than%2045%20seats%20in%20the%20120th%20Congress Provider: SimpleFunctions — https://simplefunctions.dev