Presidential candidates campaigning

US President Barack Obama and singer Bruce Springsteen wave at supporters during a campaign rally in Madison, Wisconsin, on November 5, 2012. After a grueling 18-month battle, the final US campaign day arrived Monday for Obama and Republican rival Mitt Romney, two men on a collision course for the world's top job. The candidates have attended hundreds of rallies, fundraisers and town halls, spent literally billions on attack ads, ground games, and get out the vote efforts, and squared off in three intense debates. AFP PHOTO/Jewel SamadJEWEL SAMAD/AFP/Getty Images
Jewel Samad/AFP/Getty Images

Presidential candidates campaigning

President Obama and singer Bruce Springsteen waved to supporters during a campaign rally in Madison, Wis., on Nov. 5.