Maryland voters will select nominees for the U.S. Senate seat currently held by retiring Sen. Barbara Mikulski.
Democrats on Tuesday will decide a heated primary between Reps. Chris Van Hollen and Donna Edwards. Republicans will be choosing a candidate in a crowded primary that includes Del. Kathy Szeliga and Richard Douglas.
Voters in Pennsylvania, Connecticut, Delaware, Rhode Island and Maryland are also casting primary ballots for presidential candidates in contests pivotal for Republicans and Democrats alike. Democrats are choosing between Hillary Clinton and Bernie Sanders, while Republicans are deciding among Ted Cruz, John Kasich and Donald Trump.