how strong is America's self-destructive tendency?

Obama narrowly leads McCain in AP poll
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I mean, i'm damn glad that there is a least a lead for the Dems, but how can it be so narrow? How can anyone still - after nearly 8 years of total disaster by the repugs - even consider voting for one?! Especially one who has kissed bush's ass throughout his tenure?
What the hell is wrong with people? Do they really want the end of the world?!