Mamdani-backed candidates sweep House primaries in NYC. See live results.

Democratic primary voters in New York City delivered a clean sweep to Mayor Zohran Mamdani (D) and the democratic socialist movement on Tuesday, electing a slate of left-wing House candidates who received the mayor’s backing over two sitting members of Congress and the handpicked successor of another incumbent.

A set of primary contests across the city exposed ideological and generational tensions among the city’s Democrats, pitting the young, insurgent faction that powered Mamdani’s rise against the labor unions and progressive groups that once embodied the party’s most liberal flank.

But it was the newer, further-left faction led by Mamdani and the Democratic Socialists of America that came out with the consistent edge.

In the 13th Congressional District, Darializa Avila Chevalier, a doctoral student and Mamdani campaign organizer, unseated Rep. Adriano Espaillat (D), a towering figure in Upper Manhattan and the first formerly undocumented immigrant elected to Capitol Hill.

In the 10th Congressional District, Mamdani ally and former city comptroller Brad Lander defeated Rep. Dan Goldman (D) in a race that spotlighted a rift over U.S. policy toward Israel.

And in the 7th Congressional District, the heart of Mamdani’s base, New York State Assembly member and DSA stalwart Claire Valdez won the nomination to succeed Rep. Nydia M. Velázquez. The congresswoman had endorsed Brooklyn Borough President Antonio Reynoso.

Together, the races spanning pockets of Manhattan, Queens, Brooklyn and the Bronx may foretell broader trends within the Democratic Party’s base ahead of this year’s midterm elections, as well as the 2028 presidential contest. The Democratic primary winners are all but guaranteed to win in these deep-blue districts.

Democratic socialists are likely to point to the victories as a sign of growing strength for their political movement, which has been challenging established progressive leaders on issues such as U.S. policy toward Israel and their ties to wealthy donors or machine politics.

Here’s what to know about the results from Tuesday’s elections.

U.S. House

As the Democratic Socialists of America looks to expand its ranks in Congress, two races offered a test of that group’s political power a year after it fueled Mamdani’s election to City Hall.

Espaillat, chairman of the Congressional Hispanic Caucus, faced his most competitive challenge in his decade in office from Avila Chevalier, a DSA-backed doctoral student and community organizer who worked on Mamdani’s campaign.

Espaillat drew heavy outside spending on his behalf and dismissed Avila Chevalier as an out-of-touch transplant to the area. But she turned those donations against him and said the congressman had failed to deliver for his mostly working-class constituents in Upper Manhattan and the Bronx.

Her victory was the biggest upset of the night.

In Brooklyn and Queens, the retiring Velázquez backed Reynoso, a longtime progressive leader, to succeed her in representing a DSA stronghold that activists have affectionately described as the city’s “Commie corridor.”

But Reynoso came up short against Valdez, who painted herself as a better match for the district’s increasingly leftward tendencies, even though the two candidates are almost identically aligned ideologically.

Lander, the former New York City comptroller and former candidate for mayor, did not formally receive a DSA endorsement. Yet he was also backed by Mamdani and DSA members, and his successful primary challenge against Goldman featured some of the same dynamics in a downtown Manhattan and brownstone Brooklyn district. The race largely highlighted their differences on U.S. policy toward Israel and Gaza.

In the most closely watched primary outside New York City, Cait Conley, a former Army officer and counterterrorism official, won the Democratic nomination to challenge Rep. Michael Lawler (R) in a Hudson Valley district considered one of the party’s top targets because its voters narrowly went for Kamala Harris in 2024.

Governor

Both Democrats and Republicans once anticipated a barnburner of a primary, but neither party has a contested primary for governor this year.

Gov. Kathy Hochul (D), who was at one point being challenged by her former lieutenant governor, is unopposed; so is Nassau County Executive Bruce Blakeman (R). In a state where Republicans have not won statewide in more than two decades, Hochul is expected to have the upper hand as she seeks a second full term.