Democrat Gary Peters' announcement means Michigan will have an open U.S. Senate seat for the second time in two years.

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.

Sen. Gary Peters of Michigan, who spearheaded the Democratic campaign in the Senate for the previous two election cycles, has declared that he will not run for a third term in 2026, opening up a fiercely contested battleground seat that both major political parties are likely to pursue.