Thomas John Campbell (born August 14, 1952) is an American academic, educator, and politician. He is a Professor of Law at the Dale E. Fowler School of Law, and a professor of economics at the George Argyros School of Business and Economics, at Chapman University, in Orange, California. In 2000 he retired from his House seat to run for the U.S. Senate but lost decisively to incumbent Dianne Feinstein. On June 8, 2010, he lost his third bid for the United States Senate, campaigning once again for the seat held by Democrat Barbara Boxer but losing the Republican nomination to Carly Fiorina.