Key primaries in 4 states on Tuesday to set table for November Senate, House showdowns

Key Republican and Democrat nomination contests will set the table for this autumn's battle for the House and Senate majorities as Michigan, Missouri, Kansas and Washington state hold primary elections on Tuesday.

Among the contests taking top billing is the Michigan race to succeed retiring longtime Democrat Sen. Debbie Stabenow. The seat is one of a handful in key battleground states that the GOP is aiming to flip as it works to win back control of the Senate it lost in the 2020 elections.