The month of May brought the first Senate primaries of the year. Ohio voted first, followed by a near weekly stream of contests that are shaping the midterm campaign for control of the chamber. At the close of the month, the general election matchups in almost half of this year’s most competitive races are nearly set, with the exception of Pennsylvania, where the Republican primary has gone to a recount.
The 10 Senate seats most likely to flip in 2022
