Speaking from a Jerusalem bomb shelter last week as Iran and Israel exchanged fire, a New York state senator posted a video message to New York City voters: “There is a mayoral primary coming up this week where one of the candidates does not believe the Jewish state has a right to exist,” said Sam Sutton, the senator from Brooklyn. “We don’t want to be in a situation like this in America.” Sutton called on New Yorkers to elect a “great friend of the Jewish people”: Andrew Cuomo, New York’s former governor. The appeal was a stark illustration of the...