Former New York City Comptroller Brad Lander defeated incumbent Rep. Dan Goldman (D-NY) in the Democratic primary for New York's 10th Congressional District on June 23, 2026 [1].
The victory signals a shift toward progressive leadership in the district and highlights the influence of New York City Mayor Zohran Mamdani, who backed Lander's candidacy.
Lander positioned himself as a progressive challenger capable of upsetting the incumbent during the campaign [2]. The result makes Dan Goldman the fifth House incumbent to lose a primary in 2026 [3].
The race was part of a broader trend of progressive challenges across the city. According to reports, two of the three candidates backed by Mayor Mamdani won their respective Democratic primaries [4].
Lander's win follows a period of intense campaigning where he sought to move the district's representation further to the left. The outcome was projected by major news outlets before being confirmed by the official vote tallies from the June 23 election [1], [5].
Goldman, who had held the seat, now exits the race as part of a larger national trend of primary volatility affecting incumbent members of the House [3].
“Brad Lander defeated incumbent Rep. Dan Goldman (D-NY)”
The defeat of Rep. Dan Goldman represents a successful effort by the progressive wing of the Democratic party to displace moderate incumbents. By securing a victory for a Mamdani-backed candidate, the progressive movement has demonstrated its ability to mobilize voters and leverage mayoral endorsements to reshape the composition of the New York delegation in the U.S. House.
