Collins sworn in for historic fifth term in U.S. Senate She fought through a hotly contested race last year to become the first popularly elected Maine senator to win a fifth term. U.S. Sen. Susan Collins, R-Maine, speaks in Bangor on Nov. 4, the day after her re-election victory. Robert F. Bukaty/Associated Press U.S. Sen. Susan Collins was sworn in to a historic fifth term in office on Sunday after having battled through a fiercely contested race to win re-election in November. Former U.S. Sen. and Secretary of Defense William Cohen escorted Collins to her swearing-in ceremony in the Senate chamber, along with her husband, Tom Daffron.