Select voters in New York (again!) and Florida to pick their nominees Tuesday

Voters in two of the nation’s most populous states will head to the polls on Tuesday, kicking off the last month of the midterm primaries.

Florida is conducting primary elections for federal, state and local races, while New Yorkers finally get to pick their nominees for the U.S. House and state Senate. Both states feature high-profile incumbents hoping to hang on to their seats.

Both states conduct closed primaries, meaning people may only participate in the races for parties with which they are affiliated. More than one-quarter of voters in...