Presidential hopeful Senator Barack Obama delivers a speech at a campaign stop in Lexington, Kentucky, on Sunday. Using a more enthusiastic oratorical style than usual, Obama had the overflow crowd chanting "fired up" and "ready to go" by the end of his speech. Obama has reason to crank it up a notch -- a recent Gallup poll shows he is trailing behind Senator Hillary Clinton for the Democratic presidential nomination: Clinton enjoys support ratings of 48 percent, giving her a 23-point lead over Obama, who is languishing at 25 percent.