Ballots cast in Florida
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Rush to cast early votes in Florida

President Obama and his Republican rival Mitt Romney are on the campaign trail in a final push to woo undecided voters, but many Americans have already cast their ballots.

President Obama and his Republican rival Mitt Romney are on the campaign trail in a final push to woo undecided voters, but many Americans have already cast their ballots.

Jon Sopel reports from Florida where voters queued to cast early votes on Saturday, with analysts predicting that the election will come down to a handful of swing states.