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Why, indeed, is Hillary considered so blue collar.
I've often wondered this myself. Why is this touted as her "natural base?"
I think it's a combination of her evidently having cultivated this demographic (in upstate NY, I suppose?) as well as race.
Having grown up black among this demographic (anecdotal evidence, I admit), I can testify that "uppity negroes" are not heartily embraced.
The simplified answer, then, is that race is more of a factor than gender.
I could be dead wrong, but that's my whack at the question.