New York City Mayor Zohran Mamdani waded into Democratic U.S. House primaries to boost three progressives over establishment-backed candidates. All of them won Tuesday, defeating two incumbents and essentially ensuring that two self-described democratic socialists will be elected to Congress in their deep blue districts.

The mayor said it was a question of electing “better Democrats” who would “put working people back at the heart of politics.” The approach consternated some in Democratic leadership, but the outcome showcased Mamdani’s rising influence.

Elsewhere Tuesday, two opposing factions of the artificial intelligence industry spent millions on a House race that became a proxy fight over tech regulation.

And President Donald Trump, after two of his chosen candidates for governor lost Republican primaries this month, ensured it wouldn’t happen again. The president endorsed both candidates in a South Carolina runoff — and one of his endorsed candidates inevitably won.

Mamdani successfully flexes his political power in House races