Opinion polls suggest the rivals for the presidency of the US are neck and neck, but President Barack Obama is said to have a slight lead over Mitt Romney in the country's swing states.

With still more than two days to go before America votes, bookmaker Paddy Power is paying out to punters who backed President Obama to win the US election.

President Barack Obama’s election team is mobilising a massive get-out-the-vote effort aimed at carrying the Democrat to victory as the campaign enters its final days.