New York City Mayor Zohran Mamdani is at the forefront of a political shift, backing progressive candidates in the 2026 congressional primaries. His endorsements could signal a broader embrace of democratic socialism within the Democratic Party, or reveal the limits of his influence beyond his core base.
Mamdani, a member of the Democratic Socialists of America (DSA) rose to prominence with his 2026 mayoral victory. Now, he aims to expand the progressive movement’s footprint in Congress by supporting challengers in three New York districts.
Mamdani’s Progressive Endorsements
The mayor has thrown his support behind Brad Lander in the 10th District, Darializa Avila Chevalier in the 13th District, and Claire Valdez in the 7th District. While Avila Chevalier and Valdez are DSA members, Lander is not formally affiliated with the organization.
These races are critical for Mamdani’s vision. A victory for his endorsed candidates would strengthen the progressive faction within New York’s congressional delegation. Conversely, losses could indicate that many New Yorkers are not yet ready to fully embrace his progressive agenda.
The 7th District Showdown: Valdez vs. Reynoso
The 7th District race is particularly noteworthy, as it is an open seat following the retirement of long-time Representative Nydia Velázquez. The district, known as the Commie Corridor spans parts of Brooklyn and Queens and is one of the most left-wing districts in the country.
Claire Valdez a relative newcomer to city politics, faces off against Antonio Reynoso the Brooklyn Borough President. While Mamdani and Bernie Sanders back Valdez, Reynoso has the support of Velázquez and the Working Families Party.
Recent polls show a tight race, with Valdez holding a slight edge in prediction markets. An Emerson College poll from May gave Valdez 23% support, compared to Reynoso’s 21%, with a significant 43% of voters undecided.
The 10th District Challenge: Lander vs. Goldman
In the 10th District, Brad Lander is challenging incumbent Dan Goldman. Lander and Mamdani became allies during the mayoral election, with Lander encouraging his supporters to rank Mamdani second in the ranked-choice voting system.
Progressive Democrats view Goldman as out of step with the district’s values, particularly due to his support for Israel. Polls suggest Lander is in a strong position, with an Emerson College poll giving him 57% support compared to Goldman’s 23%. Prediction markets also heavily favor Lander.
The Broader Implications
These primaries are part of a larger ideological struggle within the Democratic Party. Mamdani’s endorsements come as other democratic socialists have gained traction in major cities, including Janeese Lewis George in Washington, D.C., and Nithya Raman in Los Angeles.
The outcomes of these races could shape the party’s trajectory ahead of the 2028 presidential campaign. Mamdani has been vocal about the need for the Democratic Party to embrace a more progressive platform, criticizing what he sees as an outdated approach that focuses on limitations rather than possibilities.
As New Yorkers head to the polls, the results will provide a clear indication of whether Mamdani’s progressive coalition can reshape the Democratic Party’s future or if the establishment will maintain its hold.
