"Never interrupt your opponent when he's destroying himself" ~Paul Begala
We now have an explanation for Joe Biden's strange debate demeanor. According to Jay Carney, Joe's laughter and "sh*t-eating grin" were a result of overwhelming "passion and joy". Which I guess means he was either fantasizing about two hookers named 'Passion' and 'Joy' ... or else he was 'servicing himself' right there on stage.
OK, that was a crude remark but I think Joe 'earned' it . . . you reap what you sow!