Zohran Mamdani-backed candidates win New York Democratic primaries: What the victories mean for the party

US Democratic primaries 2026 highlight progressive victories, AI regulation battles in Manhattan, and Republican runoff outcomes reshaping internal party dynamics.

New York City Mayor Zohran Mamdani, celebrates with Democratic congressional candidate Darializa Avila Chevalier during an election night watch party Tuesday, June 23, 2026, in New York. (AP Photo)New York City Mayor Zohran Mamdani, celebrates with Democratic congressional candidate Darializa Avila Chevalier during an election night watch party Tuesday, June 23, 2026, in New York. (AP Photo)
4 min readJun 24, 2026 10:55 PM IST First published on: Jun 24, 2026 at 05:07 PM IST

New York City Mayor Zohran Mamdani strengthened his influence within the Democratic Party after several progressive candidates he backed defeated establishment-aligned rivals in key New York primary races, signalling a continued shift leftward in some of the party’s safest districts.

Mamdani, a democratic socialist and one of the most prominent progressive figures in New York politics, has increasingly emerged as an influential voice among younger Democratic voters.

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Mamdani-backed progressives score key victories

In one key race, state Assembly member Claire Valdez defeated Brooklyn Borough President Antonio Reynoso for the seat being vacated by US Rep. Nydia Velázquez, with Valdez supported by Mamdani and Reynoso backed by the incumbent, the Associated Press reported. Another major upset saw Darializa Avila Chevalier unseat five-term US Rep. Adriano Espaillat, signalling a further shift toward democratic socialist candidates in New York politics. A third Mamdani-endorsed candidate, Brad Lander, defeated US Rep. Dan Goldman in a contest shaped by divisions over Israel’s war in Gaza.