Michigan Sen. Gary Peters, who led the Democrats’ Senate campaign efforts the past two election cycles, has announced he will not seek a third term in 2026, creating a highly contested battleground seat expected to be coveted by both major political parties.

Democratic Sen. Gary Peters won’t run for re-election in Michigan in 2026, creating a pivotal open Senate seat in one of the most tightly divided battleground states in the U.S.

They will need to defend an open seat in a battleground state that President Trump carried in 2024. And Gov. Gretchen Whitmer ruled out a run.