Missouri voters are casting ballots Tuesday for primary elections in the state, where they will weigh in on several key House races.In the Democratic primary for Missouri's 1st Congressional District, former Rep. Cori Bush is running against Rep. Wesley Bell, who toppled her just two years ago.Republicans hope to flip the state's 5th Congressional District with GOP candidates vying to take on incumbent Democratic Rep. Emanuel Cleaver in November.Popular ReadsSee live election results after polls close.