So far this year, 19 state legislative incumbents — three Democrats and 16 Republicans — have lost to primary challengers.

Across the six states that have held primaries, 2.8% of incumbents running for re-election have lost, which is less than at this point in 2022 (3.7%).

The totals below include data from elections in both legislative chambers in Illinois and Ohio, all held on March 19.

1. In Illinois, two Democrats lost.
2. In Ohio, five Republicans lost.

These figures are as of March 20, and include two uncalled primaries featuring incumbents: both Democratic. For primaries held before March 19, eight races featuring incumbents remained uncalled: seven Democratic and one Republican.

Republican incumbents have lost at a higher rate than Democrats. Of the 380 Republican incumbents who filed for re-election, 16 (4.2%) have lost to primary challengers. For Democrats, three of the 305 who filed for re-election (1.0%) have lost.

Of the six states that have held primaries so far, two have Democratic trifectas, three have Republican trifectas, and one has a divided government.