2.6% of state legislative incumbents have lost their primaries so far this year

So far this year, 43 state legislative incumbents—eight Democrats and 35 Republicans—have lost to primary challengers.

Across the 14 states that have held primaries, 2.6% of incumbents running for re-election have lost, or 11.4% of the incumbents who were contested. That represents a 31% decrease from 2024 and sits 23% below the average of 56 incumbent losses each year from 2010 to 2024.