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Another reason for McCain's "mistake" may be lazy thinking or a lack of insight. Both of those scare me as much as his having malice in what he stated. I'm not one to put too much emphasis on where one went to school or class rank, but when one is a bottom-dweller of any institution (McCain graduated 5th from the bottom of the US Naval Academy) it does show laziness of the mind and a lack of effort. McCain’s most likely intelligent enough (don't really know why I think that - perhaps I'm being charitable?), but I believe he has few intellectual interests. Even most of his "writings" are with a co-writer, and we all know pretty much what that means.
McCain's just not that bright, nor does he really care. He gets by on his "personality", and of course his married and family connections.