WASHINGTON (CNN) -- Despite consistent polling that shows Sen. Rick Santorum losing to his Democratic challenger, Sen. Arlen Specter warned Sunday that people should not write off his fellow Pennsylvania Republican from winning another term.

"Well, Wolf, when you say Senator Santorum is in a fight for his life, I tell you that I've been in the fight for my life lots of times in many ways, and so far, I've won every time," Specter said in an interview on CNN's 'Late Edition with Wolf Blitzer.' "Don't count Rick Santorum out."

Santorum is being challenged by Democratic nominee Bob Casey, Jr.

On the same program, Sen. Jack Reed, D-Rhode Island, predicted that Sen. Lincoln Chafee, R-Rhode Island, would lose re-election to Democratic nominee Sheldon Whitehouse. Democrats are counting on winning Rhode Island and Pennsylvania as they try to take back control of the Senate.