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By most counts, there are two alternative ways for Mr. Romney to win without capturing the Buckeye State. In short, he would need to combine victories in Colorado, Florida and Virginia with either a win in Pennsylvania or a win in Wisconsin coupled with a victory in either Iowa or New Hampshire.

Kevin Madden, a top Romney adviser, said the campaign is confident that his boss will pull out Ohio, but that a loss there would not mark the end of Mr. Romney’s presidential dreams.

“We believe we can and will win Ohio, but because of our position right now where we are playing offense and the Obama campaign is providing defense we have a number of different paths to the 270 [electoral votes] that the governor needs to get elected,” Mr. Madden said. “I think that is where we feel most optimistic. We can go to states like Pennsylvania, and states like Wisconsin and Iowa, where they won big in 2008, but now they are defending.”

Mr. Romney started his morning with an airport rally in New Hampshire and has two more events in Colorado penciled end before the end of the day.

With just three days before the election, it has become clear during the stretch run of the campaign that Mr. Romney is intent on spending the rest of the campaign trying to appeal to independent voters with a bipartisan message.

Speaking at the Portsmouth International Airport in New Hampshire, Mr. Romney continued to make the case that he worked with Democrats in Massachusetts to balance the budget, lower the unemployment rate and increase take-home pay, and will do the same thing in Washington.

“This is a time to come together as a people,” Mr. Romney said. “We have had some long days and some very short nights and the door to opportunity is open and we are going to talk though it. Come walk with me, walk together to a better place.”