phhhhh, I dunno, I watched the whole thing, and that guy came across as a total bag of hammers. Obvious metaphor? Didn't seem so obvious to me, and if that was his intention, then he should learn to tell a joke without coming across as such a retard. You don't need to "carefully edit" his statement to make him sound like he's been sucking on the tail-pipe of a car for too long.
IMO the democrats, in general, are as large a bunch of brain-fucked gas-huffers as the republicans. I know now he's got this "metaphor" excuse, but I'm not particularly inclined to give him the benefit of the doubt, because that would make it less funny.