Believing two conflicting ideas is SOP

I agree with Sean of 538 that the McCain campaigns two anti-Obama themes (He's a vapid celebrity AND he's a risky other with nefarious ideas that will destroy America) may conflict with each other. But I think Sean puts to much weight in the idea that such conflicting themes will just confuse the electorate. Humans are quite capable of accepting two mutually contradictory ideas.

Besides, the celebrity theme is designed to appeal to one crowd while the risk other theme is designed to appeal to a different crowd. The bet is that neither crowd will think to much about the other theme (at least not enough to recognize the contradictions). And its not that dangerous a bet.