On Tuesday, Democratic voters in three New York congressional districts will decide whether a 34-year-old democratic socialist who's been mayor for six months gets to handpick their representatives in Washington. Zohran Mamdani, the DSA-backed mayor of New York City, has endorsed three House candidates — each one running against the party establishment that helped put Mamdani in office in the first place.
The people who boosted him are now watching him build the machine that will replace them.
Here's how the board is set. In NY-10, Mamdani is backing former City Comptroller Brad Lander to unseat Rep. Dan Goldman, the pro-Israel establishment Democrat. A May Emerson College poll showed Lander leading 57% to 23%. In NY-13, he's endorsed Darializa Avila Chevalier, a 31-year-old DSA member and community organizer, to take down Rep. Adriano Espaillat — a man who's held public office since 1997 and chairs the Congressional Hispanic Caucus. And in NY-7, his pick is Claire Valdez, a 36-year-old DSA assemblywoman, running for the seat being vacated by retiring 17-term congresswoman Nydia Velázquez.
Velázquez is the one who makes this story sing. She endorsed Mamdani for mayor back in April of last year. "It's just beautiful to have someone so authentic," she said of him. Her preferred successor for her own seat is Brooklyn Borough President Antonio Reynoso, a union-backed progressive. Mamdani passed over Reynoso without a second thought and endorsed Valdez instead. Velázquez gave Mamdani her credibility. He repaid her by backing someone whose primary qualification, as John Ketcham of the Manhattan Institute noted, was organizing a UAW clerical workers' union at Columbia.
Even Reynoso seems to grasp the scale of what's happening. He told PBS that Mamdani "has a celebrity status that we haven't seen the likes of since I've been alive." The man running against Mamdani's chosen candidate is openly conceding the mayor's gravitational pull.
The DSA's bet is straightforward. The Democratic Party is listless, leaderless, and desperate for energy. Mamdani and the DSA are the energy. Faiz Shakir, a senior adviser to Bernie Sanders and a Mamdani ally, laid it out plainly: "He's seeing that opportunity — that we can radically change the Democratic Party." Sanders himself is heading to Brooklyn on Thursday to hold a rally with Mamdani, because when the democratic socialist wing smells weakness, it doesn't send a memo — it sends a senator.
The NRCC, for its part, is practically writing thank-you notes. Spokesperson Mike Marinella called it what it is: "Zohran Mamdani's socialist brand is as toxic as it comes." Republicans are already framing Tuesday's primaries as a gift — the further left these nominees go, the easier the general election math gets in swing districts nationwide.
But the real story isn't the Republican reaction. It's what Mamdani's candidates represent. Avila Chevalier attended a pro-Palestinian DSA rally the day after the October 7 Hamas attacks. Valdez is a DSA member whose policy priorities align with the organization's hostility toward Israel. Lander's politics are well-documented from his tenure as comptroller. These aren't mainstream Democrats running on kitchen-table issues. They're ideological candidates running on a specific vision — and that vision has a patron.
House Minority Leader Hakeem Jeffries, a fellow New Yorker, is backing Espaillat in the NY-13 race. That's the traditional power structure pushing back. But Mamdani has something Jeffries doesn't right now: a city of eight million people and the title that goes with it. Valdez herself framed the stakes with the kind of candor party leaders tend to avoid: "Right now there's really mass dissatisfaction with the way the party leadership has been operating."
Mamdani kept Jessica Tisch as NYPD commissioner, presiding over a 6% crime reduction, which buys him just enough law-and-order credibility to make the socialist label harder to pin. He governs from the center on policing while building a congressional caucus from the far left. It's a two-track strategy, and it's working precisely because nobody in the Democratic establishment has a counter-move.
If all three of his candidates win Tuesday, the lesson writes itself: a mayor who's been in office since January can already make or break congressional careers. If you want a future in New York Democratic politics, you don't go to the party chair. You go to Gracie Mansion.
That used to be called a machine. Apparently it still is — it just runs on DSA dues now.
