Mamdani-Backed Progressives Unseat Pro-Israel Democratic Incumbents in New York Primaries

The progressive wing of the Democratic Party scored a sweeping and historic victory in New York's congressional primaries on Tuesday, as a slate of left-wing challengers backed by New York City Mayor Zohran Mamdani ousted established, pro-Israel incumbents. The races, which captivated national attention, effectively doubled as a high-stakes referendum on U.S.-Israel relations and the influence of pro-Israel lobbying money in domestic politics. In a stunning rebuke of the party's traditional power structures, democratic socialists and progressive insurgents defeated moderate Democrats in key districts across the city, cementing the progressive left as a dominant electoral force in one of the most politically vital regions in the United States.[3]

The most high-profile upset occurred in the 10th Congressional District, covering lower Manhattan and western Brooklyn, where former City Comptroller Brad Lander defeated incumbent Representative Dan Goldman. Goldman, a prominent moderate and staunch defender of U.S. military aid to Israel, found himself outflanked by Lander's grassroots mobilization. In the 13th District, which spans Upper Manhattan and parts of the Bronx, 32-year-old political newcomer Darializa Avila Chevalier unseated veteran Representative Adriano Espaillat. Avila Chevalier, a doctoral student who participated in the Columbia University Gaza encampments, overcame millions of dollars in negative advertising to secure the win. Meanwhile, state assemblywoman Claire Valdez defeated Brooklyn Borough President Antonio Reynoso for the open 7th District seat.[2][3]

The sweeping victories were engineered in large part by Mayor Mamdani, who took office last year and staked his nascent political capital on the primary races. Breaking with the traditional neutrality expected of city executives in intra-party congressional fights, Mamdani actively campaigned for Lander, Avila Chevalier, and Valdez. He framed the elections not just as local contests, but as a moral battle against the American Israel Public Affairs Committee (AIPAC), explicitly tying the local races to the ongoing conflict in the Middle East. His aggressive strategy tested whether his brand of democratic socialism could translate into broader electoral success beyond his own mayoral coalition.[3][4]

The campaign reached a boiling point in its final days when Mamdani drew fierce national backlash for his rhetoric regarding the pro-Israel lobby. At a Brooklyn campaign rally last week, the mayor referred to AIPAC as "monsters" who "move millions in dark money to accomplish a single goal — to preserve their power, so that they can turn us against one another." He accused the organization of defending a "status quo for immorality" and supporting "Netanyahu's wars." The remarks immediately ignited a firestorm, transforming the closing days of the primary into a bitter debate over political speech, lobbying influence, and the boundaries of criticizing Israel.[1][3][4]

Jewish leaders and moderate Democrats swiftly condemned the mayor's comments, accusing him of mainstreaming dangerous rhetoric. Representative Josh Gottheimer of New Jersey accused Mamdani of "laundering antisemitism," arguing that swapping the word "AIPAC" for "Jews" in the mayor's speech would reveal the oldest antisemitic conspiracy theories in the book. Rabbi Chaim Steinmetz, a senior rabbi on the Upper East Side, argued that the mayor was recklessly equating AIPAC supporters with a desire for genocide, warning that the rhetoric could fuel further antisemitism in a city already grappling with heightened tensions.[1][4]

Despite the intense pressure, Mamdani refused to walk back his statements, instead doubling down on his criticism on the eve of the election. He argued that it is necessary to "name those who allow" the death and destruction in Gaza to take place, pointing to the fact that over 1,000 Palestinians have been killed by Israeli forces since a U.S.-brokered ceasefire was agreed upon last October. By explicitly blaming the lobbying group for enabling the overseas death toll, Mamdani galvanized the progressive base, betting that outrage over the humanitarian crisis in Gaza would drive turnout among younger, left-leaning voters.[1][4]

The financial dynamics of the race underscored the magnitude of the progressive victories. AIPAC has spent heavily in the 2026 election cycle—upwards of $38 million nationally, according to political analyses—to support candidates aligned with continued U.S. military aid to Israel. In New York, the organization and its affiliated political action committees poured resources into defending incumbents like Goldman and Espaillat. However, the results on Tuesday demonstrated the limitations of that financial advantage when confronted with a highly motivated, issue-driven electorate in deep-blue districts.[3]

The platforms of the winning candidates reflect a stark departure from the Democratic establishment's traditional foreign policy consensus. Throughout their campaigns, Lander, Avila Chevalier, and Valdez all utilized terms like "genocide" and "apartheid" to describe Israel's actions in Gaza and the West Bank. In his victory speech, Lander not only reiterated his description of the Gaza conflict as a genocide but also vowed to abolish the federal Immigration and Customs Enforcement (ICE) agency. Avila Chevalier similarly campaigned on a promise to redirect funds from overseas military aid into domestic investments, signaling a fundamentally different approach to federal spending.[2][3]

For Israeli officials and pro-Israel advocates, the primary results are being interpreted as a severe warning sign. Israeli media outlets, including Ynetnews, noted that New York has historically been a bedrock of pro-Israel sentiment in the United States. The defeat of reliable allies by candidates who openly call for restricting or halting U.S. military aid suggests that the progressive left's critical stance is rapidly gaining mainstream traction. The outcome indicates that unconditional support for Israel is increasingly viewed as a political liability among the Democratic Party's grassroots base.

As the dust settles on the primary elections, the victories virtually guarantee that the Mamdani-backed candidates will head to Congress, given the overwhelmingly Democratic makeup of their districts. Their arrival in Washington will likely embolden the existing progressive "Squad" and set the stage for intense ideological clashes within the Democratic caucus over foreign policy, military funding, and the party's broader identity. For Mayor Mamdani, the sweep represents a massive validation of his political strategy, proving that his movement has outgrown his mayoral campaign and is now capable of reshaping national representation.[3]