Special Report: U.S. presidential election 2008

U.S. Democratic presidential nominee Senator Barack Obama (D-IL) campaigns at an election rally in Des Moines, Iowa, Oct. 31, 2008. Obama is campaigning in Iowa and Indiana on Friday before the Nov. 4 presidential election.(Xinhua/Reuters Photo) Photo Gallery>>>

U.S. Democratic presidential nominee Senator Barack Obama (D-IL) runs on stage at a campaign rally in Des Moines, Iowa, Oct. 31, 2008.(Xinhua/Reuters Photo) Photo Gallery>>>