Clinton sings "Imagine there's no heaven" with a chorus of Arab and Jewish children: http://www.liel.net/Liel-ClintonVideo2.wmv
Clinton didn't say that there was no heaven and neither did John Lennon. He said imagine there was no heaven.
red is right. he might have meant for us to imagine that and be sad for a while at how terrible that would have been. lennon also asked us to imagine there are no countries and no possesions either. he may be listing items that exist and that he hates. crazy communist bastard, that lennon.