79% — Will exactly 1 Senate Democratic members lose their primary in 2026
Leader: 0 at 79% · Kalshi 79% · 3 contracts · $1K volume · medium confidence
Updated 2026-05-09 07:21:22 UTC

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

Why this matters:
This market estimates an 83% probability that exactly one Democratic senator will lose their primary election in 2026. Primary losses among incumbent senators are relatively rare, particularly within a single party in one cycle. The high probability reflects expectations of strong Democratic incumbency advantages and limited primary challenges, though it could shift if high-profile primaries develop or if incumbent senators face unexpected internal-party opposition. The outcome will be definitively settled after all Senate primaries conclude in late 2026, with most states holding primaries between August and September.

Key factors:
- Number of vulnerable Democratic incumbents facing organized primary opposition as of spring 2026
- Fundraising and polling performance of Democratic senators relative to potential challengers in their respective states
- Turnout levels in Democratic primaries, which could amplify or diminish the impact of anti-incumbent sentiment
- Timing and intensity of internal party dynamics, particularly around policy disagreements or controversial votes
- Completion of all Senate Democratic primaries by November 2026, which will directly determine the outcome

Contracts:
- Will exactly 0 Senate Democratic members lose their primary in 2026?: 0 — 79¢ Kalshi $13 (weight 1%)
- Will exactly 1 Senate Democratic members lose their primary in 2026?: 1 — 18¢ Kalshi $431 (weight 43%)
- Will exactly 2 Senate Democratic members lose their primary in 2026?: 2 — 5¢ Kalshi $566 (weight 56%)

Cite as: "79% per prediction markets (SimpleFunctions, May 2026)"
Canonical: https://simplefunctions.dev/answer/loseprimarysenated
Full data: https://simplefunctions.dev/api/public/query?q=Will%20exactly%201%20Senate%20Democratic%20members%20lose%20their%20primary%20in%202026
Provider: SimpleFunctions — https://simplefunctions.dev