American Jews, long Israel’s strongest domestic backers, have turned sharply critical of Prime Minister Benjamin Netanyahu and his right-wing government over the Gaza conflict. A majority believe Israel has committed war crimes as it has killed tens of thousands of civilians and restricted food aid, and four in 10 believe it is guilty of genocide, a new Washington Post survey found — a charge Israel denies. The shift has created new incentives for even moderate Democrats in Congress to get tough on Israel, including by curtailing U.S. military aid.