US President Barack Obama and Republican candidate Mitt Romney are rushing through several election-decisive states, holding rallies in the few final hours before Election Day.

In an effort to convince the last undecided voters to go out and cast their ballot, Obama and Romney are visiting a total of seven states, while their wives and vice presidential candidates are also rallying in other parts of the country.

Bruce Springsteen sang for the President in Wisconsin and will join the President on the Air Force One, to move to Iowa and then finally reach Ohio, where Obama is to hold the last rally.

Romney started his final campaign day in Florida and is then to move to Virginia, New Hampshire and Ohio.

Both campaigns end in the state that analysts believe will be the election-winner.

Polls give Obama narrowly ahead. Cost of the presidential campaign are estimated to have broken the $2bn barrier.