U.S. Sen Barack Obama looks out over the congregation of St. Mark Cathedral before speaking at a Dr. Martin Luther King Jr. birthday celebration in Harvey, Ill., Monday, Jan. 15, 2007.
Sen. Barack Obama (D-Ill.) acknowledges the crowd at the state Democratic election celebration party in Manchester, N.H., Dec. 10, 2006. Obama, the guest speaker at the event, said he is still "running things through the traps" as he considers whether to join a more experience field of Democrats in the 2008 presidential race that's expected to include front-runner Sen. Hillary Clinton.
Sen. Barack Obama, (D-Ill.), shakes hands during a surprise visit in in Portsmouth, N.H., Sunday, Dec. 10, 2006. Obama drew large crowds curious about his presidential prospects during his first trip to the pivotal campaign state of New Hampshire while he decides whether to enter the Democratic race.
Senator Barack Obama speaks at a charity event in New York, Monday, Dec. 4, 2006.
Sen. Barack Obama, D-Ill., signs copies of his new book "The Audacity of Hope: Thoughts on Reclaiming the American Dream" at a bookstore in Chicago's Hyde Park neighborhood Tuesday, Oct. 17, 2006. It was the first stop on a book tour that will take him to a dozen cities -- including New Hampshire -- over several weeks.
U.S. Sen. Barack Obama (D-Ill.(, left, jokes with actor Jimmy Smits before addressing the 37th annual convention of the American Federation of State, County and Municipal Employees union in Chicago, Monday, Aug. 7, 2006. Smits, who portrayed a Democratic presidential candidate in the television drama "The West Wing," was a guest at the convention.
Academy Award winning Actor George Clooney, left, listens to Sen. Barack Obama (D-Ill.) during a news conference at the National Press Club in Washington, Thursday, April 27, 2006, to bring awareness to the situation in the Darfur region of Sudan.
Sen. Barack Obama (D-Ill.) introduces Wilco at the 20th anniversary Farm Aid concert, Sunday, Sept. 18, 2005, at the Tweeter Center, in Tinley Park, Ill. The day-long concert is the culmination of a week of events to benefit family farmers.
Sen. Barack Obama (D-Ill), walks the red carpet before the start of the Rock The Vote Awards in Washington, D.C., on Wednesday, June 8, 2005.
Senator-elect Barack Obama (D-Ill.) holds his daughter Milia, 6, as he acknowledges applause from supporters through a flurry of confetti after giving his acceptance speech in Chicago on Nov. 2, 2004.