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p.s. - I suppose you could suggest (either sarcastically or seriously) that, it's more likely the originator of the suggestion that the Barr candidacy would pull more voters from McCain than from Obama, or however we want to phrase it, actually did believe it, and was thus, by my reasoning, stupider than I am.
In England this sort of reasoning falls into a category called "cock-up versus conspiracy explanation" and normal people will always hurry to tell me that everything I find odd or suggestive is evidence of "cock-up" (i.e. incompetence, stupidity) rather than "conspiracy" (i.e. intentional management and manipulation of public thought). On the other hand, we also have a phrase, "well, they would say that, wouldn't they?" which has come to mean, it's an obvious lie.