** FILE ** Democratic National Committee Chairman Tim Kaine addresses a rally at the University of Delaware on Tuesday, Sept. 28, 2010, in Newark, Del. (AP Photo/Rob Carr)
Republican Senate candidate Christine O'Donnell responds to Democratic rival Chris Coons in a nationally televised debate at the University of Delaware in Newark on Wednesday night. They are vying for the seat formerly held by Vice President Joseph R. Biden Jr. (Associated Press)