HomePolitics › Which party will hold the majority in ...

Which party will hold the majority in the US Senate of the 120th Congress in January 2027? — Republican

56.5%
Consensus Probability (Model A — Inverse-Variance Log-Odds)
2 platforms · 0pp spread · $55K

Across 2 prediction market platforms, "Which party will hold the majority in the US Senate of the 120th Congress in January 2027? — Republican" has a consensus probability of 56.5%. Manifold: 54.9%, Gemini: 56.5%. Consensus via geometric mean of odds (Satopaa et al., 2014), validated by IARPA ACE tournament.

Platform Comparison — white line = consensus
Manifold
View →
55%
20 traders
Gemini
View →
56%
$55K
Probability Over Time
All 4 Consensus Models
Market Details
Manifold
Updated 12m ago
Volume
Liquidity
Bid / Ask
— / —
Spread
Opened
Apr 2026
Resolves
Jan 2027
Gemini
Updated 18m ago
Volume
$55K
Liquidity
Bid / Ask
— / —
Spread
Opened
Apr 2026
Resolves
Feb 2027

About This Consensus

Computed from 2 platforms using geometric mean of odds (Satopaa et al., 2014). This method was validated by the IARPA ACE forecasting tournament as the most accurate probability aggregation technique. Full methodology →

Odds Raven

The only prediction market aggregator with academically validated cross-platform consensus.

© 2026 Odds Raven · Data refreshed every 6 hours · peer-reviewed methodology