Three New York Democrats backed by Mamdani win House seat primaries; 2 incumbents lose

<p>Three progressive candidates endorsed by New York City Mayor <a href="https://www.cnbc.com/2026/06/23/new-york-maryland-utah-primaries-test-mamdani-trump-and-outside-money.html" target="_blank" rel="noopener noreferrer">Zohran Mamdani</a> won Democratic primaries for House seats on Tuesday night, ousting two incumbents in the process.</p>

<p><a href="https://www.cnbc.com/2026/06/23/new-york-elections-democrats-congress-dan-goldman-brad-lander.html" target="_blank" rel="noopener noreferrer">Brad Lander</a>, who previously was the city's comptroller, defeated incumbent Rep. Dan Goldman in the 10th congressional district, which includes parts of lower Manhattan and Brooklyn.</p>

<p>Rep. Adriano Espaillat conceded to Mamdani-endorsed <a href="https://www.cnbc.com/2026/06/23/prediction-market-traders-expectations-for-the-ny-primaries.html" target="_blank" rel="noopener noreferrer">Darializa Avila Chevalier</a> in the primary for the 13th District, which covers upper Manhattan and parts of the Bronx.</p>

<p>And the third Mamdani-endorsed candidate, Claire Valdez, won the primary for an open House seat representing the 7th District, which includes neighborhoods in Brooklyn and Queens. Incumbent Rep. Nydia Velázquez, who currently represents the district, is not seeking reelection.</p>

<p><a href="https://www.dsausa.org/" target="_blank" rel="noopener noreferrer">The Democratic Socialists of America</a> organization backed Chevalier and Valdez.</p>

<p> A year ago, the DSA's efforts helped Mamdani stun the local and national political world by soundly defeating former New York Gov. Andrew Cuomo in the Democratic mayoral primary, and months later in the general election.</p>