U.S. Democratic presidential candidate Hillary Clinton (D-NY) is presented with a helmet by race car driver Sarah Fisher as they stand next to her car at the Indianapolis Motor Speedway in Speedway, Indiana May 6, 2008. (Xinhua/Reuters Photo) Photo Gallery>>>

Democratic presidential candidate Senator Hillary Clinton (D-NY) speaks during a campaign stop at the Merrillville Fire Department Station #2 in Merrillville, Indiana, May 5, 2008.(Xinhua/Reuters Photo) Photo Gallery>>>