Martha Coakley, attorney general of Massachusetts, has been running her campaign for the U.S. Senate seat vacated by Ted Kennedy as the untouchable frontrunner. She started out by entering the race two weeks before anyone else and announced that she had raised $2.2 million with six weeks to go before the Dec. 8 primary election. Poll numbers have shown her beating her three opponents—U.S. Representative Michael E. Capuano (D-MA), City Year founder Alan Khazei, and Boston Celtics co-owner Stephen Pagliuca—by a wide margin. But Tuesday night, it’s anybody’s game as the four candidates go head-to-head in a televised debate held at the John F. Kennedy Presidential Library.