Democrats’ hopes of securing control of the Senate next year begin with defending a freshman from a Southern swing state that Donald Trump narrowly carried in 2024.

And Republican efforts to maintain their Senate majority center on a longtime incumbent who has managed to hang on despite representing a state that leans blue.

A year out from Election Day, Georgia’s Jon Ossoff, a Democrat seeking his second term, and Maine’s Susan Collins, a Republican seeking her sixth, top our list of the most vulnerable senators of 2026.

Several other incumbents — including Republicans John Cornyn of Texas and Bill Cassidy of Louisiana and Democrat Edward J. Markey of Massachusetts — also make our list. But their biggest challenge is likely to come in the primary from a member of their own party.

The r

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