Democratic congressional candidate Brad Lander (R) arrives with New York City Mayor Zohran Mamdani for an election night watch party in New York City on June 23, 2026. Ryan Murphy/AP Photo

NEW YORK CITY—All three candidates endorsed by New York City Mayor Zohran Mamdani won their closely-watched House primary races on Tuesday, handing the democratic socialist a victory in his bid to move his party more to the left.

On the job for fewer than six months, the mayor waded into three congressional primary races, backing democratic socialists and progressives against more established Democrats.

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