As governor, he overhauled the state's education system and served as chairman of the National Governors Association. Clinton was elected president in 1992, defeating incumbent Republican opponent George H. W. Bush. At age 46, he became the third-youngest president in history. During the campaign, questions of conflict of interest regarding state business and the politically powerful Rose Law Firm, at which Hillary Rodham Clinton was a partner, arose. Clinton then pointed to his moderate, 'New Democrat' record as governor of Arkansas, though some on the more liberal side of the party remained suspicious. Many Democrats who had supported Ronald Reagan and Bush in previous elections switched their support to Clinton.