Thirty state legislative incumbents—seven Democrats and 23 Republicans—have lost to primary challengers so far this year.

Across the 10 states that have held primaries, 2.7% of incumbents running for re-election have lost, a decline from the 2022 election cycle that aligns more closely with 2020.

These totals include data from the Nebraska State Senate and both legislative chambers in West Virginia, which held elections on May 14, 2024.

• In Nebraska, no incumbents lost.
• In West Virginia, six Republicans lost.
• An additional six races in West Virginia, all with Republican incumbents, remained uncalled as of May 15.

Republican incumbents have lost at a higher rate than Democrats. Of the 659 Republican incumbents who filed for re-election, 23 (3.5%) have lost to primary challengers. For Democrats, seven of the 459 who filed for re-election (1.5%) have lost.

Of the 10 states that have held primaries so far, two have Democratic trifectas, six have Republican trifectas, and two have divided governments. 

The figures for 2024 are subject to change. There are currently eight uncalled primaries featuring incumbents: one Democratic and seven Republican.