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New York City Mayor Zohran Mamdani’s endorsement proved influential in three key congressional primary races on Tuesday, as his favored progressive candidates prevailed over opponents more closely aligned with the Democratic establishment.
New York State Assemblywoman Claire Valdez and Harlem community organizer Darializa Avila Chevalier, both of whom were also backed by the Democratic Socialists of America, won races in New York’s seventh and 13th congressional districts, respectively. Meanwhile, former city comptroller Brad Lander, a progressive former DSA member, pulled off an impressive upset over incumbent Representative Dan Goldman in NY-10. Lander is a Jewish progressive who left the DSA in 2023 after it held a pro-Palestinian rally just one day after Hamas’s terror attacks on Israel on October 7, 2023.
Lander and Goldman, who is also a Jewish Democrat, both made their stances on the Israel-Hamas war a key part of their respective campaigns. Lander, who sits to the left of Goldman politically, had criticized his opponent for failing to take a tougher stance on Israel.
Avila Chevalier prevailed over incumbent Representative Adriano Espaillat despite her status as the most controversial of the three Mamdani-backed progressives. While Espaillat is the chairman of the Congressional Hispanic Caucus “who has over the years built a political machine of his own in upper Manhattan and parts of the Bronx,” according to Politico, Avila Chevalier is a first-time candidate who was well known in Harlem for her pro-Palestinian activism but whose unearthed social media posts made her a political liability for the DSA. Those posts included messages blasting Democratic politicians, including one 2021 post in which she wrote “f*** Kamala Harris,” and others against an array of topics from the police to Israel and private property.
Mamdani, for his part, said he wasn’t aware of her past comments when he endorsed her, but he did not pull his endorsement nonetheless.
The mayor also endorsed Valdez in her bid to assume the seat left open by retiring Representative Nydia Velázquez. The outgoing Democratic congresswoman had endorsed Brooklyn Borough President Antonio Reynoso as her replacement. Mamdani and the DSA’s decision to endorse a different candidate led to a falling out with Velázquez, who had been an early supporter of Mamdani’s mayoral run.
Ahead of Election Night, the co-chair of the DSA’s New York City chapter, Gustavo Gordillo, told Politico, “The stakes couldn’t be higher for us.”
If Valdez and Avila Chevalier win the general election, the pair would join Representatives Alexandria Ocasio-Cortez (D., N.Y.) and Rashida Tlaib (D., Mich.) in the House, doubling the number of DSA members in Congress.
The primary races served as a test of the Democratic Socialists’ ongoing electability, after the progressive group won big with Mamdani’s election in 2025.