In New York, a Socialist Wave Topples the Democrats' Old Guard

For nearly a decade, Adriano Espaillat embodied the kind of Democrat who wins in upper Manhattan: a Dominican-born former state senator, a leader of the Congressional Hispanic Caucus, a politician who knew every block of Washington Heights and Harlem. On the night of 23 June he lost his seat to a 32-year-old organiser who had never held office.

Darializa Avila Chevalier, a member of the Democratic Socialists of America who first drew notice helping to lead pro-Palestinian protests at Columbia University, took just under half the vote in New York's 13th District to Espaillat's roughly 46 percent. Her victory made the five-term congressman the sixth House incumbent in the country to lose renomination this cycle — and the most senior casualty of a night the party's New York establishment will not soon forget.

The night the incumbents fell

Espaillat was not alone. In Lower Manhattan and parts of Brooklyn, Representative Dan Goldman — backed by Governor Kathy Hochul and the House Democratic leader, Hakeem Jeffries — lost the 10th District to Brad Lander, the former city comptroller, who took close to two-thirds of the vote. In an open Brooklyn seat being vacated by the retiring Nydia Velázquez, the democratic socialist assemblywoman Claire Valdez defeated Antonio Reynoso, the borough president the party's old guard had anointed as Velázquez's successor.

What linked the winners was not only ideology but a single name. Each had been endorsed by Zohran Mamdani, the democratic socialist who became mayor of New York last year and has since turned his coalition into the city's most consequential political machine. The races he touched broke his way with striking consistency. Israel ran through nearly all of them: the challengers cast the incumbents as too cautious on Gaza and too distant from primary voters who have moved sharply left.

Addressing supporters, Valdez said the result proved the movement was "durable — that it is growing."

An establishment caught off guard

The reaction from senior New York Democrats was unusually raw. Attorney General Letitia James, herself a fixture of the party's progressive wing, told CNN she was "disappointed" and questioned the readiness of the newcomers Mamdani had elevated.

"Some of the candidates that he has supported are individuals who do not understand the politics of New York City, the cultural differences from district to district, who have not been part of the history and the struggle of some of these districts, and are relatively new to the body politic."

The night was not a clean sweep. In the seat vacated by the veteran Jerrold Nadler, the establishment-backed assemblyman Micah Lasher won a crowded race without Mamdani's endorsement — a reminder that the insurgency, for all its momentum, has limits.

The fight over November

Because these districts are overwhelmingly Democratic, the primaries are, in effect, the elections; the winners are all but certain to enter Congress in January. That is precisely what unsettles the party's centre. With control of the House in play in November, moderates worry that a louder socialist bloc — and the label that comes with it — hands Republicans a weapon in the swing districts that will actually decide the majority.

Mamdani framed the results as vindication. "We are showing there is a new path for politics in our city and in our country," he said.

Jeffries, whose own preferred candidate had just been beaten, tried to lower the temperature, insisting the party could absorb the disagreement without fracturing.

"We have agreed to strongly disagree. A handful of primaries that go in one direction or the other, in a given state or two, aren't going to reshape who we are."

Whether that holds is now the central question of the American left. The young insurgents arriving in Washington will owe their seats not to the party leadership but to a movement, and to a mayor, with their own ideas about how to confront Donald Trump's final term. New York has answered, loudly, who it wants. The rest of the country votes in November.