Vice President Joe Biden campaigns in Canton, Lorain; Paul Ryan in Colorado stumping for Mitt Romney

CLEVELAND - As the third and final presidential debate nears, which will focus on foreign policy, Vice President Joe Biden campaigned in Canton and Lorain, emphasizing differences between Barack Obama and Mitt Romney's views on the war in Afghanistan.

"We will leave Afghanistan in 2014, period. They say it depends," he said. "Ladies and gentlemen, like everything with them, it depends. It depends on what day you find these guys."

Obama's campaign launched a television ad in Florida that said the president ended the war in Iraq and has a plan to do the same in Afghanistan, accusing Romney of opposing him on both. It was not clear how often the ad would air, given the fall's overall focus on the economy.

Romney's running mate, Wisconsin Rep. Paul Ryan, was in Colorado. "We are in the midst of deciding the kind of country we're going to be, the kind of people we're going to be, for a generation," he said.

Whatever the outcome of the final face-to-face confrontation, the debates have left an imprint on the race. Romney was widely judged the winner of the first debate over a listless president on Oct. 3, and he has risen in polls in the days since. Obama was much more energetic in the second.

Monday night marked the third time in less than a week that the president and his challenger shared a stage, following the feisty 90-minute town-hall-style meeting last Tuesday on Long Island and a white-tie charity dinner two night later where gracious compliments flowed and barbs dipped in humor flew.