Bernie Sanders Backs Claire Valdez in NYC House Race Dividing Left and Progressives

Sen. Bernie Sanders endorsed socialist New York State Assembly Member Claire Valdez on Thursday in a Democratic primary shaping up as a test of how factions of New York City’s progressive wing will work together under Mayor Zohran Mamdani. 

The race to replace retiring Rep. Nydia Velázquez in New York’s 7th Congressional District has put major progressive organizations and figures at odds. Hoping to capitalize on growing national frustration with conservative Democrats and lingering momentum from Mamdani’s win in November, national progressives and their counterparts in New York are fighting to succeed Velázquez with an ally in Congress.

They just haven’t agreed on who it should be. 

Sanders, the Vermont independent, is giving a boost to the socialist wing behind Valdez’s campaign, which includes Mamdani and the New York City chapter of the Democratic Socialists of America, the campaign shared with The Intercept.

“Claire Valdez is a union organizer who worked minimum-wage fast food jobs and understands firsthand how this economy fails working people,” Sanders said in a statement to The Intercept. “In my view, Congress needs more voices who come from America’s working class. Claire has the experience and vision we need to take on the oligarchy and fight for unions, Medicare for All, and affordable housing. I’m proud to endorse her campaign for Congress.”

Velázquez has endorsed Brooklyn Borough President Antonio Reynoso, Valdez’s main competitor. Reynoso also has backing from leading progressive officials and groups in New York City like Public Advocate Jumaane Williams and the New York Working Families Party. 

Already facing losses this cycle in races where competing progressive candidates did not consolidate their support, national progressives like Sanders are picking sides in the battle to define the future of the electoral left under Mamdani.

Velázquez endorsed Reynoso shortly after Valdez launched her campaign in January standing alongside Mamdani and United Auto Workers President Shawn Fain. Some local observers saw Velázquez’s move as a rebuke of the mayor and a harbinger of a fight between factions of New York City’s left, endangering a relationship Mamdani and Velázquez had built since she became the first member of Congress to back his mayoral campaign.

Velázquez left little room to speculate on that question in comments she made to the New York Times in January, when she said Mamdani had opened up conflict between groups in his coalition by involving himself in primaries; that she was unfamiliar with Valdez, who is originally from Texas; and that she was skeptical of newcomers to the city who think they know who should represent New Yorkers in office.

In a statement to The Intercept, Valdez named Sanders as a key inspiration for her political beliefs and career.

“Three things made me a democratic socialist: shitty jobs, the labor movement, and Bernie Sanders’ runs for president,” Valdez said. “His political revolution changed my life — and showed millions of Americans what’s possible when working people organize. I’m grateful for this endorsement and ready to join the fight in Congress against the oligarchs and for economic democracy.”

On Wednesday, the Valdez campaign announced that it had raised $750,000 from 11,200 donors in the filing period that just ended, though the Federal Elections Commission has not yet processed and verified the figures. Reynoso had raised just over $317,500 by the end of 2025, before Valdez launched her campaign, according to available FEC data. His campaign has not yet announced its most recent fundraising figures and did not immediately respond to a request for comment.

Valdez’s endorsements include PAL PAC, the new pro-Palestine group opposing the American Israel Public Affairs Committee; Justice Democrats; Leaders We Deserve PAC; Jewish Voice for Peace Action; attorney and political advocate Zephyr Teachout; Democratic New York State Sen. Jabari Brisport; and several members of the New York State Assembly.

Reynoso’s backers include Make the Road Action; New York Communities for Change; several powerful local unions including 32BJ SEIU and DC-37; Attorney General Letitia James; New York Democratic Reps. Jerry Nadler and Pat Ryan; and several New York City Council members.