New York primaries show Mamdani-style politics spreading

Three Democratic primary wins in New York City—aligned with Mayor Zohran Mamdani—have pushed the question beyond whether a certain brand of politics can travel. The closer look turns to the left-aligned groups behind the campaigns, highlighting how endorsement

On Tuesday, the arguments in Democratic Party circles about what can and can’t win sounded theoretical—until the ballots started coming in.

In New York’s congressional primaries. three insurgent progressive candidates carried all three major contested primaries. with victories tied to the city’s popular mayor. Zohran Mamdani. The winners were state assembly member Claire Valdez, former city comptroller Brad Lander, and community organizer Darializa Avila Chevalier. Their races weren’t just high-profile for who they challenged; they were high-profile because two of them were against incumbents.

Valdez defeated the sitting Brooklyn Borough president, Antonio Reynoso, who also enjoyed the support of the outgoing Rep. Nydia Velázquez, D-N.Y. Lander, after he won the 10th District Democratic primary on June 23, 2026, in Brooklyn, defeated incumbent Dan Goldman. Chevalier defeated an incumbent representative as well.

Attention in the political class has been drawn to Mamdani as a “kingmaker.” But Tuesday’s results put a spotlight on something less discussed: the left-aligned institutions that helped drive these campaigns from the inside.

Both Valdez and Chevalier were supported by the Democratic Socialists of America. Lander was supported by the Working Families Party. with the article noting that both organizations largely operate within Democratic Party politics—though the Working Families Party does sometimes nominate candidates separate from the Democratic Party. The endorsement wasn’t framed here as just a logo on a brochure; it came with an existing volunteer base. field operations. and time-tested organizing.

That impact was laid bare when those New York races were compared with a contest where progressive groups largely sat on the sidelines. In New York’s Sixth District, Chuck Park—a former foreign service worker and progressive—challenged Rep. Grace Meng, D-N.Y. Meng defeated Park 57% to 43%.

The contrast sharpened when the piece looked back to 2020, when Meng faced a primary challenger again. In that race, Meng defeated Meliquiades Gagarin with 65% support to Gagarin’s 20% support, with another candidate receiving around 14% support. Park’s coalition. the article says. was built with little to no outside support from statewide and national groups. and Park also received donations from individual people rather than political fundraising committees.

Park, in an interview with Salon, described what he thought was missing. “It’s absolutely clear to us that the lack of some institutional power and institutional support. to provide either funding or field reinforcements. is where we fell short. ” Park told Salon. “I think it could have been the difference if we had either a Working Families Party endorsement many months ago. or if I had sought DSA endorsement many. many months ago.”.

For party leaders and centrist Democrats, that takeaway landed with unease. The piece reports a wave of consternation from the party’s leadership and centrist wing. arguing that candidates of this type can’t win outside places like New York City. and that their nominations damage the Democratic Party’s brand. The arguments are described as echoing similar claims made by centrists last year after Mamdani’s primary victory.

Even in the Park story, the question of institutional support runs straight through the timeline. The article says Park publicly sought the endorsement of the Working Families Party. Membership voted overwhelmingly to support him, but the endorsement was not approved by party leadership. It also says Park’s agenda was basically aligned with that of DSA candidates. but he did not seek the DSA endorsement in this year’s campaign. When asked whether he would run again in 2028. and seek the support of one of these groups or a national organization like the Justice Democrats. Park said he had not made that decision yet.

DSA leadership. when asked about future ambitions and whether they might broaden the scope of their endorsements in the future election season. pointed to a membership-driven process rooted in internal votes. Grace Mausser. a DSA co-chair. said: “NYC-DSA is immensely proud of our accomplishments Tuesday. and our success will certainly factor into our strategic considerations in the future. Our endorsement process is extremely democratic and member-driven.” She added. “We can’t say for sure what endorsement we will make in the future. but we will definitely be debating and deciding them collectively.”.

The organizing numbers themselves underline why Tuesday looked different from other cycles. Park’s campaign, the article says, recruited around 1,000 volunteers by the end of the campaign. The Valdez campaign, by contrast, boasted more than 4,000 volunteers by the end of the campaign.

The sequence in Tuesday’s results is hard to miss: endorsers weren’t just making ideological statements. Their support came with volunteer infrastructure, and that infrastructure—when it showed up—was credited with changing what candidates could do on the ground.

Still, the disagreement inside the Democratic Party isn’t just about volunteers. It’s about where that energy is supposed to go next.

Usamah Andrabi. the communications director at the Justice Democrats—a group involved in Tuesday’s races that works to elect progressive Democrats to the House—told Salon that this style of politics is already translating beyond New York. Andrabi pointed to candidates like state Rep. Chris Rabb in Philadelphia, Dr. Adam Hamawy in New Jersey, and Rev. Frederick Douglass Haynes III in Texas, all of whom won their respective primaries. He also pointed to Rep. Summer Lee. D- Pa. who represents Pennsylvania’s 12th district in the western part of the state. as someone who has succeeded in deploying this political strategy in an area often seen as a bellwether for national politics.

“There’s a reason it’s our most successful cycle to date. and that’s because Democratic voters are looking for progressive fighters who excite them and galvanize them but who will have the moral courage and political clarity to not only take on and defend Republican extremism. but also root out the corporate rot in the Democratic Party. ” Andrabi said.

Andrabi described the winning formula as a campaign vision that excites people—something he said the centrist wing of the Democratic Party often struggles to replicate. “What we are seeing is such an excitement for these left-wing progressive champions of the working class. and that is exactly what the Democratic Party has been asking for and demanding and paying millions of dollars to research to figure out how to win. ” he said. “It’s being handed to them on a silver platter and the only reason they’re not accepting this and running with people like these leaders at the front of every ticket is that our party continues to be more beholden to lobbies like AIPAC. crypto and corporate interest than the needs of our own voters.”.

The next chapter starts quickly, because Tuesday’s primaries are already rolling into the next tests. Following New York’s primaries, the article identifies Colorado as the next high-profile matchup, where attorney Melat Kiros is facing Rep. Diana DeGette, D-Co., in a Denver area district.

But it’s November that promises the loudest verdict. The piece says the most high-profile test of this left populist style of politics and political campaigning will likely come when Democratic nominee Graham Platner faces off against Sen. Susan Collins, R-Maine, in the closely watched Maine Senate race. In Michigan, if Dr. Abdul El-Sayed prevails in the Democratic primary in the Michigan Senate race. his candidacy would also be seen as a test for the statewide viability of these politics in a major presidential swing state.

For Democrats still arguing about what New York can export, Tuesday provided more than talking points. It delivered concrete results—three contested primary wins. bruising defeats of incumbents. volunteer numbers that ballooned with institutional help. and a fresh set of political pressure tests waiting in Colorado. Maine. and Michigan.

New York congressional primaries Zohran Mamdani Claire Valdez Brad Lander Darializa Avila Chevalier Antonio Reynoso Nydia Velázquez Working Families Party Democratic Socialists of America Grace Meng Chuck Park Justice Democrats AIPAC Summer Lee Chris Rabb Adam Hamawy Frederick Douglass Haynes III Melat Kiros Diana DeGette Graham Platner Susan Collins Abdul El-Sayed