PHILADELPHIA (AP) _ Big spending by the Obama campaign may narrow Sen. Hillary Clinton's lead, but Gov. Ed Rendell still expects Clinton to win the Pennsylvania primary.

"Anytime you're outspent 3-to-1, you can't be overconfident," Rendell, a Clinton supporter, said Sunday on NBC's "Meet the Press."

"I'm saying that we will win this state, but we'll win it somewhere between ... 5 and 10 percentage points," Rendell said.

The governor appeared on the program with Sen. Bob Casey, D-Pa., an Obama supporter.

Casey acknowledged that Obama faces an uphill fight in the April 22 contest in Pennsylvania, where Clinton has led in the polls.

"It's going to be tough in the primary," Casey said. "But I think what he does in the spring will lay a foundation for the fall, and I think he's connected. ... And I think he's inspired people."

Rendell, contrary to some pundits, said he believes that Obama could win Pennsylvania.

He pledged to support him if he becomes the party nominee.

"I have disagreed with people who said that Senator Obama can't win Pennsylvania," Rendell said. "He can, and if he's the nominee, Bob Casey and I will be working together with every ounce of energy we have. But Senator Clinton is more likely to carry Pennsylvania."