Speaking at an Ohio rally Sunday afternoon, Romney said that it's possible, but not likely that Obama will win. He was responding to supporters who booed when he speculated on the consequences of an Obama second term.
Polls suggest the race is very close. Both campaigns predict wins.
Romney is campaigning in four battleground states on Sunday, including Pennsylvania. Romney's visit follows the decision by his campaign and its Republican allies to put millions of dollars in television advertising in Pennsylvania during the race's final weeks to try to make it competitive.
No Republican presidential candidate has carried the state since 1988.
(Copyright 2012 by The Associated Press. All Rights Reserved.)