Jean Chamberlain (1970-1974), Gary Eschenauer (1958-1970), Kathy Ries (1971-1975), Rosemary Smith (1959-1963), Jon Ernst (1994-1998), Mallory Conger (1998-2002)
Walker -- in Iowa to attend GOP Iowa Sen. Jon Ernst's "Roast and Ride" event -- left Marquette University without a degree more than two decades ago. According to Fusion, President Harry Truman was the last U.S. president who did not have a college degree.