At best for Biden, the protests are a passing distraction while the White House presses forward with negotiations over a ceasefire and the release of hostages held by Hamas while pushing Israel to limit casualties with more than 34,000 Palestinians dead. At worst, they build momentum toward the Democratic National Convention in Chicago in August, potentially triggering scenes of violence that could recall the unrest of protests against the Vietnam War during the party's convention there in 1968. The protests at Columbia University in New York and other campuses have captured global media attention and resurfaced questions about Biden's lagging...