Former Illinois U.S. Senate candidate Alan Keyes and 21 other protesters were arrested this morning when they refused to leave the Notre Dame campus during a protest of President Obama’s upcoming commencement address there, authorities said. Keyes and the others were arrested on trespassing charges when they refused to leave campus, a university spokesman said. All 22 were being held in the St. Joseph County Jail on misdemeanor criminal trespass charges, in lieu of $250 bond each, said St. Joseph County Sheriff’s Sgt. Bill Redman. Keyes was among a group of 26 protesters, some of them pushing baby carriages with dolls covered in fake blood, who entered the campus and were greeted by Notre Dame police, said university spokesman Dennis Brown.