Tens of millions of Americans head to the polls on Tuesday to decide whether to re-elect President Barack Obama or hand the job to Republican Mitt Romney.
The voting ends a hard-fought race that began nearly two years ago and has cost more than $2bn (�1.3bn).
Polls will begin closing in eastern states at 19:00 EST (00:00 GMT) - a winner could be known by midnight.
Polls show the race is neck and neck, although the president holds a slender polling lead in crucial swing states.
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