Last night’s Democratic primaries in New York City delivered clear momentum for the Democratic Socialists of America (DSA). Three high-profile congressional races saw Mamdani- and DSA-aligned candidates prevail, building directly on Mayor Zohran Mamdani’s 2025 upset victory and signaling a more organized push from the party’s left flank into federal office.
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These weren’t fringe races. They took place in safely Democratic districts where the primary winner is all but guaranteed a seat in Congress come November. The results add fresh energy (and some tension) to the national conversation about where the Democratic Party is headed heading into the 2026 midterms.
The Key Wins
NY-7 (Brooklyn-Queens area): State Assemblymember Claire Valdez, a DSA member and union organizer endorsed by Mayor Mamdani, defeated Brooklyn Borough President Antonio Reynoso and other challengers. She captured roughly 56-58% of the vote in a race framed as a test of DSA organizational strength versus more institutional progressive politics.
NY-10: Former New York City Comptroller Brad Lander, backed by Mamdani, ousted two-term Rep. Dan Goldman in a strong progressive showing (around 66% to 34%).
NY-13 (Upper Manhattan and the Bronx): Community organizer and DSA member Darializa Avila Chevalier defeated five-term incumbent Rep. Adriano Espaillat. Early results showed her edging out the veteran congressman in a contest that highlighted divides over issues like housing, policing, and foreign policy.
These victories are part of a broader DSA/Mamdani slate performance in New York, with multiple endorsed candidates advancing or winning across congressional, state assembly, and local races. Mamdani’s volunteer network and brand appear to have transferred real power in these low-turnout primaries.




