NEW YORK (AP) — Democratic nomination contests for New York’s seats in the closely divided U.S. House take center stage Tuesday in a state primary where relatively few of the state’s top officeholders will appear on the ballot. One incumbent who is not up for election but has emerged as a key figure in the campaign is New York City Mayor Zohran Mamdani, who is looking to shape the city’s congressional delegation through a series of endorsements, including for challengers to two Democratic