Obama and Romney in second debate
Obama and Romney in second debateAFP/Stan Honda

As the U.S. presidential race nears its end, polls released on Saturday show President Barack Obama and Republican candidate Mitt Romney are neck and neck in four swing states that are likely to determine the winner of the election.

A Reuters/Ipsos poll found that in Ohio, Obama has a very slight lead over Romney with 46% compared to 45% support among likely voters. In Florida they are tied at 47%.

In Virginia, Obama leads Romney 48% to 45% and in Colorado, Romney leads Obama 47% to 45%, the poll found.

An NBC News poll showed that Obama has the support of 51% of likely voters to Romney's 45%. In Florida, Obama has 49% while the Republican nominee trails with 47% support.

A Reuters/Ipsos daily tracking poll from Thursday found that Obama is being backed by 47% of likely voters and Romney is receiving 46% of voters’ support.

The poll also found that only 11% of Romney’s supporters said they might change their mind, and just 8% of Obama’s backers indicated the same.

Both candidates returned to the campaign trail over the weekend, which was suspended for several days as Hurricane Sandy hit the East Coast.

Obama said on Thursday, "As long as there's a single American who wants a job but can't find one, our work isn't done. As long as there are families who are working harder but falling behind, our work isn't done."

"Our fight goes on because America has always done its best when everybody gets a fair shot. And everybody is doing their fair share. And everybody is playing by the same rules. That's what we believe," he added.

Romney, meanwhile, said, "I know the Obama folks are chanting 'four more years, four more years'. But our chant is this: 'Five more days!'"

He ridiculed Obama for what he dubbed "small measures" -- including the president's announcement this week that he wants to create a "secretary of business" -- that Romney said will do nothing to turn the economy around.

"We don't need a secretary of business to understand business; we need a president who understands business, and I do," he said.