New York primaries test Mamdani, Trump and AI money in House races

Voters in New York, Maryland, Utah and South Carolina go to the polls Tuesday in primaries that could measure the strength of party establishments, outside spending and high-profile endorsements. The marquee contest is New York's 12th District, where Democrats are picking a successor to retiring Rep. Jerry Nadler in a crowded Manhattan race that includes Alex Bores, Micah Lasher and Jack Schlossberg. Bores' stance on artificial intelligence regulation has helped turn the race into a broader fight over how Democrats should police a fast-growing industry. In other New York races, Mayor Zohran Mamdani is backing challengers in several House contests, while upstate Republicans will test whether President Donald Trump's endorsement can outweigh local party networks in the race to replace Rep. Elise Stefanik.