Ever since his stunning victory in June’s Democratic primary, Mamdani has built alliances with politically liberal Jewish officials while meeting with and listening to some of his most strident critics. For Yom Kippur, considered the holiest day in the Jewish calendar, Mamdani attended service at Lab Shul, a non-denominational Jewish congregation. He was accompanied by Rep. Jerry Nadler and City Comptroller Brad Lander, both prominent Jewish politicians in New York who have endorsed Mamdani. None of the mainstream Jewish organizations who met with Mamdani would disclose details about their meetings on the record. Democrats and younger Americans across the political spectrum have grown more negative toward the Jewish state, even as support for Israel remains key for many Jewish voters.