By Marcus Leach
Following election campaigns that have cost billions of dollars, the wait is finally over for America as the country heads to the polls.
After almost two years of campaigning Barack Obama and Mitt Romney are now powerless as the voters make the decision. Will they re-elect Obama? Or will they decide to give Romney the Republican the job?
Polls will begin closing in eastern states at 19:00 EST (00:00 GMT) - and a winner could be known by midnight.
Following three live debates many opinion polls have had Obama in the lead, albeit by the slenderest of margins, although the 'swing states' could yet play a major role in this battle.
The election is decided by the electoral college. Each state is given a number of electoral votes in rough proportion to its population. The candidate who wins 270 electoral votes - by prevailing in the mostly winner-take-all state contests - becomes president.
"We've come too far to turn back now," the president said in Ohio, in his last press for votes.
"We've come too far to let our hearts grow faint... We'll finish what we started. We'll renew those ties that bind us together and reaffirm the spirit that makes the United States of America the greatest nation on Earth."
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