San Francisco Mayor Daniel Lurie is riding high in approval polls, but Tuesday night dealt a stinging blow to his cousin Dan Goldman, whose New York congressional seat vanished under a 30-point landslide in a Democratic primary that turned almost entirely on one question: how close are you to AIPAC?

Goldman's demolition at the hands of former New York City Comptroller Brad Lander in the 10th Congressional District carries a direct warning for San Francisco politics, where the identical AIPAC fault line is reshaping the CD-11 race between State Sen. Scott Wiener and Supervisor Connie Chan. For any Democrat hoping to hold a progressive urban seat in 2026, New York just ran the experiment — and the results are in.

Goldman, a former federal prosecutor who rose to national prominence pursuing participants in the January 6 Capitol assault, represented a district spanning Lower Manhattan and brownstone Brooklyn. He and Lurie are cousins by marriage who grew up together and were once roommates as young adults in New York; both are heirs to the Levi Strauss fortune, according to the San Francisco Standard.

Lander, running on his record as a progressive city comptroller and a pointed critic of Israel's conduct in Gaza, made Goldman's relationship with the American Israel Public Affairs Committee the spine of his campaign. AIPAC endorsed Goldman and channeled donations to his campaign through its website. The left-leaning group J Street also backed Goldman's bid — but in this district, that center-left foreign policy alignment proved radioactive with the electorate.

New York Mayor Zohran Mamdani, a Democratic Socialist whose endorsement slate swept the city Tuesday, threw his weight behind Lander and campaigned with him. In a victory speech, Mamdani said Lander "brings a vision of politics that is more than what we've seen for so long," according to the Standard.

The margin wasn't close. Lander won every precinct in the liberal enclaves of Brooklyn Heights, Cobble Hill and Carroll Gardens, and beat Goldman by more than 30 points overall, according to voter data analyzed by Gothamist. The 10th District's electorate — younger, well-educated, concentrated in gentrified brownstone Brooklyn — is almost precisely the profile of urban constituencies that are moving hardest against candidates aligned with AIPAC in 2026.

Goldman was one of two incumbent House members knocked out Tuesday. Mamdani-backed insurgents also toppled Rep. Adriano Espaillat in Upper Manhattan and swept DSA candidates into state legislative seats across the outer boroughs.

House Democratic Leader Hakeem Jeffries, who had backed Goldman, moved to contain the damage Wednesday. "There are 215 members of the House Democratic Caucus," he told Gothamist. "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 as House Democrats."

It read as damage control. Goldman, for his part, used his concession speech to warn about rising antisemitism, arguing that Jewish Americans have been "at the forefront of every single civil rights issue in this country for the past century," according to the Standard — framing his loss as part of a broader disturbing pattern rather than a verdict on his AIPAC alignment.

The San Francisco parallel is difficult to miss. The Dissent has reported extensively on AIPAC-linked super PACs putting roughly $500,000 behind Connie Chan in CD-11 — a dynamic that Wiener's campaign has made central to its messaging. Wiener, whose own Gaza positioning has shifted during the race, is now publicly challenging Chan to 15 debates before November.

Mayor Lurie, who emerged from San Francisco's June supervisorial elections as a formidable political force with his endorsees running the table, did not respond to a request for comment about his cousin's defeat, according to the Standard. His silence is its own kind of statement.