First Polls Close for New Jersey, Iowa, and Montana Primaries

The trio of states will nominate candidates for two Senate and three House races that could upset the balance of power in the next Congress.

A 'Wait Here To Vote' sign is seen in a polling location as voters check in to cast ballots in Atlanta, Ga., on May 21, 2024. Elijah Nouvelage/Getty Images

ATLANTIC CITY, N.J.—Three states hold primary elections on June 4 in a pair of Senate contests and a handful of House races that could impact the balance of power in the next Congress.

Voters in New Jersey and Montana will nominate candidates for the U.S. Senate, where the Democratic Party will attempt to preserve its slim majority by retaining one open and one vulnerable seat.