What’s at Stake in the New Jersey, Iowa, and Montana Primaries

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. In New Jersey and Iowa, the parties will nominate candidates in three races that the Democrats hope to flip in November. New Jersey 7th Incumbent Rep. Thomas Kean Jr. (R-N.J.) faces only token opposition in the primary. The real challenge is expected in the general election as the Democratic Congressional Campaign Committee has targeted the 7th district as one of 34 open or Republican-held seats to capture this year....