US Republican presidential candidate Mitt Romney and his wife Ann arrive at a campaign rally at George Mason University on November 5, 2012 in Fairfax, Virginia. After a grueling 18-month battle, the final US campaign day arrived for President Barack 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/Mandel NGAN