Both presidential campaigns have strongly focused on Pennsylvania and its 21 electoral votes in recent weeks.
Vice presidential candidate and Alaska Gov. Sarah Palin personally acknowledged the importance of the state when she visited Shippensburg (Pa.) University last Tuesday.
"It's going to come down to the wire," she said. "A lot of folks are telling us it will probably come down to Pennsylvania."
Democratic Gov. Ed Rendell predicted "a single-digit election" in Pennsylvania when he visited the campus two days later.
Pennsylvania hasn't voted for a Republican since 1988, although George W. Bush won 70.5 percent of the vote in Franklin County in 2004.