ORANGEBURG, S.C. (AP) -- Colin Powell told graduates of South Carolina's premier historically black university that they were graduating during a tumultuous time that saw a royal wedding, a pope's beatification and a U.S. military assault that killed Osama bin Laden, "the worst person on earth." But the former secretary of state and Joint Chiefs chairman told South Carolina State University's 400 graduates on Friday that he particularly enjoyed another recent event: "That was when President Obama took out his birth certificate and blew away Donald Trump and all the birthers!"