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I think there is something more subtle going on here: McCain and Palin are trying to make the other side so scary that people vote AGAINST Obama, since there is surely no reason for more than a small group (the 22 percenters that still support Bush) to vote for McCain. How does someone in McCain's position get votes? Not by making an affirmative case for himself, but by scaring people about the other side. That way, people can justity their votes for McCain by declaring that they were against Obama.
Think about it!