Our initial list of the Senate’s most vulnerable incumbents for the 2026 cycle is shorter than usual after three Democratic incumbents from competitive states announced that they wouldn’t seek reelection next year.
A year and a half out from Election Day, just three senators are running for another term in states rated as “Battlegrounds” by Inside Elections with Nathan L. Gonzales. Georgia Democrat Jon Ossoff, North Carolina Republican Thom Tillis and Maine Republican Susan Collins are all gearing up for tough races and awaiting announcements on who will step up to challenge them.
For now, this trio makes up the most vulnerable members in the chamber, although there’s plenty of time for more incumbents to get on the list as the midterm election cycle develops. Candidate recruitment throughout the rest of the year could also shake up the list.
