New York City Mayor Zohran Mamdani and his allies secured major victories in Tuesday's congressional primaries, with three of their candidates defeating incumbent Democrats or establishment-backed rivals in New York districts that were among the mayor's strongest during his 2025 election win. The results represent a significant expansion of the democratic socialist movement's influence in Washington and have sparked debate over the future direction of the Democratic Party.
Brad Lander, a former New York City Comptroller, dethroned Democratic Rep. Dan Goldman in the primary for New York's 10th District, capturing about two-thirds of the vote. State legislator Claire Valdez then defeated Brooklyn Borough President Antonio Reynoso in the open 7th District, where longtime Rep. Nydia Velázquez is retiring. And Darializa Avila Chevalier, a young democratic socialist and community activist, unseated 10-year Rep. Adriano Espaillat, chairman of the Congressional Hispanic Caucus, in another Brooklyn-based district.
The three districts share similarities: all are among New York City's most rapidly gentrifying neighborhoods, and all were areas where Mamdani performed strongest in his mayoral election against Democratic former Gov. Andrew Cuomo last fall. The victories follow other contested primary wins for progressive and socialist candidates in recent months across Maine, California, Pennsylvania, and New Jersey.
What the Right Is Saying
Republicans quickly seized on the results as evidence of a leftward shift within the Democratic Party. National Republican Congressional Committee spokesperson Mike Marinella said in a statement: "Tuesday was the night the Democrat establishment officially surrendered to Zohran Mamdani and the socialist wing of their party. Every House Democrat, in safe and competitive districts alike, will now answer to the radicals calling the shots."
The defeated incumbents and their supporters pointed to their progressive accomplishments as they conceded. Goldman served as lead counsel during President Donald Trump's first impeachment. Reynoso led the City Council's Progressive Caucus. Espaillat is a former undocumented immigrant who has pressed the Trump administration on immigration issues. Velázquez, along with other prominent city political leaders, backed Reynoso in her retiring district.
In Maryland's 5th District, where longtime Rep. Steny Hoyer is retiring after decades of service, state Del. Adrian Boafo—a former Hoyer aide—won the Democratic primary. There was no indication that millions spent by a pro-Israel super PAC to boost him did anything but help his campaign. In Utah's 1st District, former Rep. Ben McAdams won the Democratic primary over a progressive state lawmaker backed by Sen. Bernie Sanders of Vermont.
What the Left Is Saying
Progressive supporters of the winning candidates framed Tuesday's results as a mandate for a new direction within the Democratic Party. Rebecca Katz, a prominent Democratic strategist whose firm worked with Mamdani during his 2025 run, said at a victory celebration: "The energy is there, but every congressional district is different. To win in November, Democrats must embrace candidates who can authentically speak to the electorate they're running to represent."
In his victory speech, Lander said of Mamdani: "It was an honor one year ago to work together to elect him the mayor of New York City," adding, "What a glorious time to be a New Yorker." The three winning candidates all ran on platforms calling for Medicare for All, a public option for housing, and more aggressive criticism of Israel's conduct in its war against Gaza. All three described Israel's actions as genocide and made the issue a central part of their campaigns.
The challengers argued that longtime incumbents were out of step with Democratic voters on Israel and economic issues. Avila Chevalier charged Espaillat with neglecting his working-class constituents, while Valdez argued she would be a stronger advocate than Reynoso in criticizing Israel. Assemblyman Alex Bores, who lost the 12th District race after running an aggressive campaign calling for AI regulation, said in a statement: "Though we've come up short tonight, the example set here was not the one the AI oligarchs intended."
What the Numbers Show
Lander captured approximately two-thirds of the vote in defeating Goldman—a significantly larger margin than most observers predicted heading into Election Day. The three victorious candidates all ran in districts that voted heavily for Mamdani in his mayoral race, suggesting their campaigns successfully mobilized similar coalitions.
Tuesday's primaries across four states drew tens of millions of dollars from super PACs funded by the artificial intelligence industry and pro-Israel groups. In New York's 12th District alone, competing visions for AI regulation attracted substantial outside spending before Assemblyman Micah Lasher won with backing from Rep. Jerry Nadler, Gov. Kathy Hochul, and former Mayor Michael Bloomberg.
In upstate New York's 17th District—one of the most competitive congressional districts in the country—former National Security Council official and Army veteran Cait Conley won the Democratic primary with support from national party groups. She will face Republican Rep. Mike Lawler this fall in a race that could help determine control of the House.
Other notable results included: state Del. Adrian Boafo winning the Maryland 5th District to succeed Hoyer; Ben McAdams defeating Sanders-backed candidate in Utah's new 1st District created after courts struck down previous congressional maps; and Conley's victory over several primary opponents including progressive challenger Samelys López, who was backed by Justice Democrats.
The Bottom Line
Tuesday's results demonstrate that Mamdani has successfully translated his mayoral political operation into a force capable of influencing federal elections. The victories give democratic socialists three additional seats in Congress if the candidates win in November, potentially reshaping debates within the Democratic caucus on issues ranging from healthcare and housing to foreign policy.
For Democrats broadly, the outcomes present both an opportunity and a challenge heading into the midterm elections. While progressive energy appears strong in certain urban districts, Republicans are already using the results to paint all Democrats as aligned with socialist positions—an attack that could resonate in more competitive suburban districts where control of the House will likely be decided.
What happens next: The three winning candidates now face Republican opponents in November in heavily Democratic-leaning districts, making them favorites to win. Their success or failure will test whether the democratic socialist platform that powered their primary victories can also appeal to general election voters—and whether Mamdani's political model can scale beyond New York City.