43% — Will House Control be Democratic AND Senate Control be Republican for Feb 2027
Leader: D-House, D-Senate at 43% · Kalshi 43% · 3 contracts · $65K volume · medium confidence
Updated 2026-08-10 08:37:43 UTC

Tracks the leading outcome in a winner-take-all prediction market set with 3 outcomes.

Why this matters:
This probability represents the chance that Democrats control the House while Republicans control the Senate following the 2026 midterm elections. At 39%, it's tied with the scenario of unified Democratic control, suggesting markets see these two outcomes as roughly equally likely. The level reflects uncertainty about the midterm environment: economic conditions, approval ratings, and historical patterns of divided government all influence whether voters will support one party for the House and the other for the Senate. The outcome will be determined on election day in November 2026, though early voting patterns and polling trends in the weeks leading up to that date will provide signals about which scenario is most probable.

Key factors:
- Current aggregate sentiment prices Democratic-controlled Senate at 78% (39% D-D scenario + 39% D-R scenario), suggesting that's the heavily favored outcome for upper chamber control
- Republican Senate control is priced at only 22% combined (17% R-R + 5% residual), indicating markets assess Senate Republican hold as significantly less likely than a Democratic flip
- The tied pricing between unified Democratic control (39%) and split control with Democratic House (39%) shows high uncertainty about whether voting patterns will produce consistency or division
- Historical midterm patterns and current seat distributions in both chambers will constrain which scenarios are practically achievable
- Polling trajectory and economic indicators through autumn 2026 will be the primary driver of probability shifts before November election day resolution

Contracts:
- Will House Control be Democratic AND Senate Control be Democratic for Feb 2027?: D-House, D-Senate — 43¢ Kalshi $7K (weight 11%)
- Will House Control be Democratic AND Senate Control be Republican for Feb 2027?: D-House, R-Senate — 39¢ Kalshi $7K (weight 10%)
- Will House Control be Republican AND Senate Control be Republican for Feb 2027?: R-House, R-Senate — 14¢ Kalshi $51K (weight 78%)

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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: 2026-08-10T07:20:49.270Z*

By SimpleFunctions — https://simplefunctions.dev/

Cite as: "43% per prediction markets (SimpleFunctions, August 2026)"
Canonical: https://simplefunctions.dev/answer/balancepowercombo
Full data: https://simplefunctions.dev/api/public/query?q=Will%20House%20Control%20be%20Democratic%20AND%20Senate%20Control%20be%20Republican%20for%20Feb%202027
Provider: SimpleFunctions — https://simplefunctions.dev