US presidential rivals Barack Obama and Mitt Romney face a final sprint across swing states for undecided voters, on their last day of campaigning.

Mr Romney is in Florida, where polls suggest he has the edge, and will head to Virginia, New Hampshire and Ohio. Mr Obama is scheduled to appear in Madison, Wisconsin, accompanied by Bruce Springsteen, before going on to Iowa and Ohio.

Analysts say the election will come down to a handful of swing states. Mr Obama and Mr Romney are running almost neck-and-neck in national polls, in a campaign that has cost more than $2bn (£1.2bn). But surveys of the nine-or-so battleground states that will determine the election show Mr Obama narrowly ahead.

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