The Republican presidential nominee campaigns in the Philadelphia area on Friday. He is to meet donors at a high-dollar fundraiser before a midday rally at Valley Forge Military Academy and College.
A Republican presidential candidate has not won Pennsylvania in nearly a quarter-century.
Romney aides privately concede that Obama has a significant advantage in the state with the election just 40 days away. Romney's visit - his first to the state in more than two months - is mainly to raise money.
Obama will stick close to Washington on Friday, where he has three fundraising events. Both men will devote time this weekend to preparing for Wednesday's debate.
(Copyright 2012 by The Associated Press. All Rights Reserved.)