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Because Schaller, who has a good point hidden in there somewhere, keeps mashing the two ideas together. Talking about white males, or white southern males, or non-union vs. union white males--fine, those are clearly defined categories. But when we start talking about "NASCAR dads," or "security moms," or the "soccer" types, or whatever, we're confusing the isue with--well, not even stereotypes, but lazy-bored-media memes, for god's sake. At times, he seems to be defining Teh White Males as Those Guys Who Aren't Going to Vote Democratic Anyway. Yes, by all means, don't bother with those guys.
I nearly typed "NASCAR dadaists" up there. That may be my demographic.