WASHINGTON - The family photographs came down Monday, packed in bubble wrap and boxes for the trip home, leaving nothing but some nails and sun-faded outlines on the walls of Pennsylvania Sen. Arlen Specter's inner office. After 30 years on Capitol Hill, the state's longest-serving senator is clearing out and heading back to Philadelphia. Specter, 80, will deliver his final floor speech Tuesday morning, decrying a gridlocked Senate that has lost its political center and the sense of collegiality that once kept senators from campaigning against one another. "Eating or defeating your own is a form of sophisticated cannibalism," Specter,...