U.S. Rep. Joe Sestak is only half-done with his exploratory tour of Pennsylvania's 67 counties but he's talking like he already has decided to challenge Sen. Arlen Specter (D., Pa.) next year.

U.S. Rep. Joe Sestak is only half-done with his exploratory tour of Pennsylvania's 67 counties but he's talking like he already has decided to challenge Sen. Arlen Specter (D., Pa.) next year.