TOPSHOTS People fill their ballots at a polling station in Washington,DC on November 6, 2012. Americans head to the polls after a burst of last-minute campaigning by President Barack Obama and Mitt Romney in a nail-biting contest unlikely to heal a deeply polarized nation. After a long, expensive and fiercely negative campaign, voters will decide whether to re-elect Obama despite the plodding economy or hand the reins to Romney, who has vowed a return to prosperity through smaller government. AFP PHOTO/Nicholas KAMM