NEW YORK ? As protests over Israel's war in Gaza continued Friday on college campuses across the U.S., Columbia University negotiated with student demonstrators while soon-to-be graduates at the University of Southern California grappled with the cancellation of the school's main commencement ceremony. At Columbia, students were still on the campus' various lawns following a rumored midnight deadline to clear the encampments. The Ivy League school has been the epicenter of student protests for over a week, especially after the university's president, Minouche Shafik, called in the New York City Police Department and more than 100 students were arrested last...