'Joe the Plumber' Sets Sights on Congress Obama Sports Politically Correct Tie In N.C., president jokes his tie appeals to both Duke and Tar Heel fans. Samuel Wurzelbacher wins GOP nomination in Ohio to make a run for Congress. McCain to Panetta: 'We're Not Leading' on Syria Senator says U.S. is not showing unilateral leadership in the crisis in Syria. George and Diane's Super Tuesday Surprise Stephanopoulos, Sawyer break from anchor duties for a visit to the couch. Super Tuesday: Romney's Battle Ahead Matthew Dowd and James Carville discuss the Super Tuesday results. Super Tuesday: Mitt Romney Wins Key Races John Berman breaks down the big primary election night results.