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True that there is usually a change in the governing party when the economy tanks. But these are not ordinary times. Conventional wisdom can easily be turned on its head.
And calling McCain a "lapdog" for Bush may help vent one's anger, but it really doesn't do anything to convince others. Name-calling and hyperbole tend to shut a listener's mind to reason.
P.S. In IT we have a maxim -- never "assume" anything, because if you're mistaken it makes an "ass" out of "u" and "me". Get it? :)