New York City Mayor Zohran Mamdani is leveraging his political momentum to challenge Democratic Party establishment figures in Tuesday's primary elections, backing progressive candidates against incumbent representatives in a fight over the party's direction on issues from housing affordability to Middle East policy.
Mamdani, a 34-year-old democratic socialist who took office six months ago, will join Sen. Bernie Sanders, I-Vt., at a get-out-the-vote rally in Brooklyn on Thursday. The event is intended to elevate a slate of candidates aligned with Mamdani's values, including two running against Democratic incumbents in Tuesday's primary.
Challenging Party Incumbents
The Mamdani slate includes political organizer Darializa Avila Chevalier, whom Mamdani endorsed over Rep. Adriano Espaillat, the chairman of the Congressional Hispanic Caucus, in New York's 13th District, which includes parts of upper Manhattan and the Bronx. Mamdani is also backing former New York City Comptroller Brad Lander, who is running against incumbent Rep. Dan Goldman in New York's 10th District, and democratic socialist state Assembly Member Claire Valdez in New York's 7th District against outgoing Rep. Nydia Velazquez's handpicked successor.
Valdez said the election is about advancing the political movement Mamdani ignited on his way to City Hall. She said, "Right now there's really mass dissatisfaction with the way the party leadership has been operating and not standing up strongly enough to Trump," and said she hopes to "bring a partner to Zohran to Washington."
Valdez's primary opponent, Brooklyn Borough President Antonio Reynoso, said he feels like the underdog in the race even though he was endorsed by the outgoing incumbent. He said Mamdani "has a celebrity status that we haven't seen the likes of since I've been alive." Reynoso added, "He's going to be our champion for the foreseeable future and he's doing a great job, and when he says that he's endorsing someone, it matters," and said, "I believe that this community has seen me work, they know I'm a progressive champion, and in any other circumstance I would be a favorite to win this race, but I'm not because he has tipped the scale."
Platform Focused on Affordability and Foreign Policy
The candidates are largely aligned on the biggest issues, though there are modest differences. Israel's war with Gaza has featured heavily among the Mamdani slate, with Lander, Valdez and Avila Chevalier casting their Democratic opponents as too soft on Israel. They are echoing the mayor's criticism of the country's leaders and trying to harness what they believe could be a driving force in this year's elections. Mamdani's candidates have also sought to replicate much of the platform that sent him to City Hall, focusing on the city's high cost of living and presenting themselves as fresh faces not beholden to powerful business interests.
Party Leadership Pushes Back
In Washington, Democrats are pleasantly surprised that Mamdani has become less of a political liability for the party in swing district seats than they once feared. But his endorsements have aggravated intraparty fissures, especially among moderates who worry that his far-left brand may eventually tarnish the entire party. House Minority Leader Hakeem Jeffries, a fellow New Yorker, has tried to push back against the Mamdani-backed democratic socialist challengers by endorsing and campaigning for the embattled incumbents in a proxy fight with the mayor. Jeffries and Mamdani have opted to wrestle only in primaries rather than bicker publicly and feed GOP narratives of Democratic disarray.
Antjuan Seawright, a Democratic strategist who works with House Democrats, said, "Democrats must understand, and both the leader and Mamdani appreciate this, how to yell in areas where we agree and whisper in areas where we diverge." Jeffries' allies say Mamdani has energized Democratic voters and may be able to reach some Americans who have checked out of the political process, and they prefer that he remain focused on New York City governance rather than traveling nationally.
Republican Strategy
Republicans, however, plan to elevate Mamdani's profile whether Washington Democrats want them to or not. The GOP has not made Mamdani a central feature of its broader national messaging as it once threatened, but Republican operatives have sought to link him to Democratic House candidates in swing districts across California, Colorado and Wisconsin. They also believe the New York City mayor will loom large in pivotal House races in New York and New Jersey.
Mike Marinella, a spokesperson for the National Republican Congressional Committee, said, "Zohran Mamdani's socialist brand is as toxic as it comes. And during a time when Democrats don't have a leader or a message, he's exactly the kind of bogeyman we can use against Democrats to truly show who is leading their party and the crazy policies they all support." Sanders' adviser Faiz Shakir encouraged Republicans to try, saying Sanders mentions Mamdani in almost every speech as he tours the nation rallying voters ahead of the midterms. Shakir said, "The crowd just goes nuts," and added, "He certainly is not a political liability."
Why This Matters:
Tuesday's primary contests represent a critical test of whether grassroots progressive energy can overcome establishment Democratic power structures in competitive districts. The outcome will shape the party's approach to core economic justice issues—from housing affordability to corporate influence—that directly affect working families struggling with rising costs. With candidates explicitly running against what they describe as insufficient resistance to Trump and corporate interests, these races reflect broader tensions over whether the Democratic Party adequately represents communities demanding stronger protections and more accountable leadership. The results could determine whether progressive challenges to incumbents become a sustainable pathway for change or remain limited to select districts, with implications for how the party addresses inequality and responds to voters seeking alternatives to establishment politics.