DPC Barack Obama (22 images)

Barack Obama (L) smiles as he receives presidential endorsements from Sen. Edward Kennedy, Rep. Patrick Kennedy (Rear,L) and Caroline Kennedy(R,R), daughter of the late President John Kennedy, at a rally at American University in Washington on January 28, 2008. Ted Kennedy's endorsement as sought by all three of the Democratic presidential contenders. (UPI Photo/Pat Benic)

Sen. Barack Obama (D-Ill.) points to the crowd after speaking at a forum of Democratic Presidential candidates hosted by the American Association for Justice at their 2007 Annual Convention in Chicago on Sunday, July 15, 2007. (UPI Photo/Brian Kersey)

Sen. Barack Obama, D-IL, pictured in a January 5, 2007 file photo departing the White House in Washington, announced his plans to run in the 2008 presidential election on January 16, 2007 (UPI Photo/Roger L. Wollenberg/FILES)

Democratic presidential hopeful, Sen. Barack Obama (D-IL) (L) and his wife Michelle, wave to supporters at an election night rally in Chicago, on February 5, 2008. Voters in 24 states, including Obama's home state of Illinois, cast ballots in the Super Tuesday elections. (UPI Photo/Brian Kersey)