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"It is not reasonable to assume that 28% see the differnces of Republican and Democratic policy as no big deal. Not when McCain is essentially Bush III."
Ahhh... you commit the basic mistake of political junkies. You assume that other people share your POV. Maybe those 28% _don't_ view him as "Bush III".
Or, maybe, each one of the members of that 28% group sees _something_ they like about him that overrides what they see in Obama -- whether it be policy or a character trait. Or it could be the inverse -- that they see something in Obama they _don't_ like and they would be willing to accept the policy difference because of it.
Which brings me back to what I think is the big mistake the Obama camp committed this election year -- believing that the Democratic Party "owns" its voters. No party "owns" its voters. They will readily switch sides if they believe it is in their own interest.
Thus, the appearance of the "McCain Democrats" -- something nobody imagined as recently as January.
Ah, the wonderful complexity of human beings. Keeps all these political pundits on their toes, lol.