The Largest Senate Seat Losses for the President's Party Since 1942, Ranked

If projections hold, the Democrats' nine seat gain in 2026 will be tied for the third largest seat gain in a midterm election in eighty-four years.

The entry for 2026 is based on projections as of November 9, 2026. Only midterm elections where the president’s party lost at least five seats are shown.
Chart: Oscar BerrySource: UC Santa Barbara American Presidency Project