Democratic congressional candidate Claire Valdez speaks during a Get Out The Vote rally ahead of New York's primary election, Thursday, June 18, in the Brooklyn borough of New York. (AP Photo/Ryan Murphy)

NEW YORK (AP) — When Varun Venkatesh cast his ballot in New York’s primary this week, he thought about “a good litmus test for me as a voter.” He wanted to know what the candidates are doing for the Palestinian cause.

The 27-year-old Brooklyn resident decided to support Claire Valdez, who was backed by Mayor Zohran Mamdani, over Antonio Reynoso, another progressive who was the choice of the Democratic establishment, because she had “a clear and more consistent stance.”

Valdez triumphed in her congressional primary, as did two other insurgent candidates endorsed by Mamdani, and Israel was a key issue in each of the races. Now the question for Democrats is how many more voters like Venkatesh are out there as the party charts its path toward the November midterms and the next presidential election.

The war in Gaza began with Hamas’ Oct. 7, 2023, attack on Israel, which responded with a yearslong counterattack that left more than 73,000 dead. About 1,000 have died since a ceasefire was reached in October, according to the Hamas-run health ministry that does not differentiate between civilian and combatant casualties.

Human rights groups and a United Nations commission have described Israel’s actions as a genocide, a charge that’s been rejected by Israeli Prime Minister Benjamin Netanyahu.

Democrats on the left — and even some conservatives — have ratcheted up pressure to suspend U.S. aid to Israel, a shift that’s been shadowed by a rise in antisemitism across the political spectrum.

“The Israel question has become defining,” said Matt Bennett, who leads the centrist Democratic group Third Way and frequently criticizes progressives as jeopardizing outreach to independent voters. He argued that some in Mamdani’s camp have embraced “a new level of extremism,” warning that “Republicans are very good at weaponizing crazy ideas on the fringe against mainstream candidates.”