Zohran Mamdani’s surprise 56%-to-44% victory over former governor Andrew Cuomo in New York City’s ranked-choice Democratic mayoral primary has rattled the party’s establishment, particularly Jewish lawmakers alarmed by the candidate’s past support for the Boycott, Divestment and Sanctions movement and his refusal to denounce the “globalize the intifada” slogan. Representatives Debbie Wasserman Schultz, Greg Landsman, Josh Gottheimer and Jared Moskowitz said Mamdani’s rhetoric is “disturbing” at a time of rising antisemitic violence in the United States. The political shockwaves extend to Capitol Hill, where leaders of the Democratic Socialists of America—emboldened by Mamdani’s win—are weighing primary challenges against five New York House incumbents. House Minority Leader Hakeem Jeffries tops their target list, alongside Jerry Nadler, Dan Goldman, Ritchie Torres and Yvette Clarke. Jeffries dismissed the threat, telling CNN he has “no idea what these people are talking about,” while senior adviser André Richardson warned that any challenge would meet a “forceful and unrelenting” counter-offensive. Senate Democratic leader Chuck Schumer sought to tamp down the dispute, insisting the party remains focused on inflation and health-care issues. Only Nadler has formally endorsed Mamdani, and his aides are now helping the nominee court skeptical Jewish voters. The simmering intraparty fight underscores broader tensions as Democrats prepare for the 2026 midterms, balancing an energized progressive base against concerns that ideological infighting could jeopardize efforts to reclaim the House majority.