The Class of 2027: Guaranteed Turnover
Before a single November vote is counted, a floor of turnover is already locked in: every open seat — where the incumbent retired, hit a term limit, or is running for another office — and every incumbent already defeated in a primary will send someone new to the statehouse in January. For anyone whose work depends on legislative relationships, this is the minimum share of each chamber you'll be re-introducing yourself to. November only adds to it.
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Guaranteed New Legislators
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Open Seats
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Incumbents Defeated in Primaries
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Open Governorships
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States Counted
Every Chamber, Ranked by Guaranteed Turnover
| Share of Chamber ▼ | Chamber | Guaranteed New | Open Seats | Primary Defeats | Races in 2026 |
|---|
How this is counted. "Guaranteed new" = open seats (no incumbent on the ballot)
plus incumbents who already lost a primary — a floor, never a ceiling: every incumbent still on a
November ballot could lose, and none of these seats can revert. Only states whose candidate filing
deadline has passed are counted (before filing closes, a missing incumbent isn't yet an open seat).
Counts are per race; in the few multi-member bloc districts a single race elects two members, so the
true seat floor runs slightly higher. Special-election appointees and mid-term vacancies aren't
counted as turnover here.