Democratic Presidential hopeful, Sen. Barack Obama, D-Ill., right, and his wife Michelle greet supporters in Raleigh, N.C. after Obama won the North Carolina Democratic presidential primary election on Tuesday, May 6, 2008. (AP Photo/Chuck Burton)
US Democratic presidential candidate Senator Barack Obama (D-IL) and his wife Michelle wave to supporters at his North Carolina and Indiana primary election night rally in Raleigh, North Carolina May 6, 2008. REUTERS/Chris Keane
US Democratic presidential candidate Senator Barack Obama (D-IL) faces supporters at his North Carolina and Indiana primary election night rally in Raleigh, North Carolina May 6, 2008.
REUTERS/Jason Reed
A supporter of US Democratic presidential candidate Senator Barack Obama (D-IL) cheers at his North Carolina and Indiana primary election night rally in Raleigh, North Carolina May 6, 2008. REUTERS/Ellen Ozier
Supporters cheer for Democratic presidential hopeful, Sen. Barack Obama, D-Ill., before a primary election night rally in Raleigh, N.C.,Tuesday, May 6, 2008. Obama swept to victory in the North Carolina presidential primary.
(AP Photo/Jae C. Hong)
Supporters of US Democratic presidential candidate Senator Barack Obama (D-IL) wait for results at his North Carolina and Indiana primary election night rally in Raleigh, North Carolina, May 6, 2008. REUTERS/Jason Reed
Democratic presidential hopeful, Sen. Barack Obama, D-Ill., left, reaches into the crowd after his speech in Raleigh, N.C., and winning the North Carolina Democratic presidential primary Tuesday, May 6, 2008. (AP Photo/Chuck Burton)