The obama campaign.

Sen. Barack Obama, D-Ill., speaks to a crowd of 75,000 at Waterfront Park in Portland, Oregon, Sunday, May 18, 2008.

Barack Obama walks from his plane on October 3, 2008 after arriving in Philadelphia, Pennsylvania on his way to a rally in Abington, Pennsylvania.

Supporters of Democratic presidential nominee Senator Barack Obama (D-IL) listen to his speech during a downpour during a campaign rally at the University of Mary Washington in Fredericksburg, Virginia September 27, 2008.

Barack Obama (lower right) waves as he arrives at a rally of 100,000 supporters in St. Louis, Mo., Saturday, Oct. 18, 2008.