Protests on dozens of college campuses calling for divestment from Israel on behalf of the pro-Palestinian movement are starting to concern Democrats. Heated protests ranging from support for people in Gaza to unveiled threats against Jews have sparked debate and split elected officials’ responses. Some Democrats visited Columbia University last week to condemn antisemitism. The elite university was at the center of several controversies, with virulent antisemitism cropping up outside the school’s gates and among its protest’s central leaders, as well as the high-profile suspension of Rep. Ilhan Omar’s (D-MN) daughter at Barnard College. A sign sits erected at the...