PITTSBURGH, PA  - APRIL 22:  Democratic presidential candidate Senator Barack Obama (D-IL) (2nd L), his wife Michelle (3rd L) and Pittsburgh Steelers Owner Dan Rooney greet customers at Pamela's diner in the Strip District April 22, 2008 in Pittsburgh, Pennsylvania. Voters in Pennsylvania go to the polls today. Getty Images logo Getty Images 46 months ago

PITTSBURGH, PA - APRIL 22: Democratic presidential candidate Senator Barack Obama (D-IL) (2nd L), his wife Michelle (3rd L) and Pittsburgh Steelers Owner Dan Rooney greet customers at Pamela's diner in the Strip District April 22, 2008 in Pittsburgh, Pennsylvania. Voters in Pennsylvania go to the polls today.