The Democratic Party is fracturing over U.S. support for Israel, a division that cuts deeper than past disputes over socialism or immigration and is already reshaping Senate races across the country.

The conflict has split even longtime Democratic constituencies. Some Jewish critics of the Netanyahu government argue that the Oct. 7 Hamas attack—which killed 1,200 Israelis and took hundreds hostage—did not justify the subsequent killing of thousands of Gaza civilians or Israeli airstrikes targeting journalists and emergency medical personnel. But pro-Israel Jewish voters increasingly say they would back Republicans, including Vice President JD Vance or Sen. Marco Rubio, if the Democratic Party unites against further U.S. aid to Israel.

In Michigan, the divide turned tangible. After Democrat Abdul El-Sayed won the primary for U.S. Senate, Detroit businessman Eric Bronstein, a Democrat, wrote an open letter endorsing Republican Mike Rogers, a former U.S. Representative. The letter prompted several Jewish Democratic bundlers to hold a fundraiser for Rogers. But Michigan's Democratic Attorney General Dana Nessel refused to endorse him, telling a gathering of Jewish Democrats that there is a "moral imperative to place the needs of the world above even our own self-interest"—a statement that outraged pro-Israel activists.

In Georgia, Michael Morris, publisher of the Atlanta Jewish Times, publicly challenged Sen. Jon Ossoff, a Jewish Democrat up for reelection and a potential 2028 presidential candidate. Morris wrote an open letter accusing Ossoff of "antagonism toward Israel" and demanded he stop "lying" about his support for the country. Both El-Sayed and Ossoff recently distanced themselves from antisemitic posts by Twitch streamer Hasan Piker, but legacy Jewish organizations said the rejections came too late and rang hollow.

Florida's U.S. Senate primary crystallized the party's schism most sharply. State Rep. Angie Nixon, a democratic socialist, accused Israel of committing genocide and criticized frontrunner Alex Vindman for remaining silent on the issue. Nixon introduced legislation in the Florida legislature calling for de-escalation and a ceasefire in Israel and occupied Palestine. She refuses AIPAC money and supports cutting U.S. aid to Israel. Her primary victory signals that accepting contributions from the American Israel Public Affairs Committee has become a liability for many Democratic congressional candidates.