President Obama (center), in the final hours of a four-state campaign day, is joined by former President Bill Clinton (left) and former Virginia Gov. Tim Kaine, who is running for the U.S. Senate, at a rally at Jiffy Lube Live Arena in Bristow, Va., late on Saturday night, Nov. 3, 2012. (AP Photo/J. Scott Applewhite)

Photo by: J. Scott Applewhite

President Obama (center), in the final hours of a four-state campaign day, is joined by former President Bill Clinton (left) and former Virginia Gov. Tim Kaine, who is running for the U.S. Senate, at a rally at Jiffy Lube Live Arena in Bristow, Va., late on Saturday night, Nov. 3, 2012. (AP Photo/J. Scott Applewhite)