DPC Barack Obama (22 images)

Democratic presidential hopeful Sen. Barack Obama (D-IL) speaks during a news conference in Chicago on March 12, 2008. Obama received the endorsement of several retired Admirals and Generals Wednesday. (UPI Photo/Brian Kersey)

Democratic presidential hopeful Sen. Barack Obama (D-IL) waves to supporters with his family at a victory rally in Des Moines, Iowa on January 3, 2008. Obama emerged with a clear win over rivals John Edwards and Hillary Clinton in the Democratic caucus. (UPI Photo/Mark Cowan)