Simone Zimmerman, the Bernie Sanders campaign’s newly hired national Jewish outreach coordinator, is quite familiar with the American Jewish establishment. She is used to fighting against it. During the 2014 Gaza war, Zimmerman was one of the leaders of a group of young Jews that held regular protest vigils outside the offices of the Conference of Presidents of Major American Jewish Organizations, reading the names of Palestinians and Israelis killed in the conflict. She opposes Israel’s occupation, wants Hillel to allow participation by groups that support the Boycott, Divestment and Sanctions movement against Israel, is against Jewish federation funding for...