Last night on Lopez Tonight, Mariah answered the question that her Precious character Mrs. Weiss wouldn't reveal: Her "color". (Mariah fans already know her ethnic lineage verbatim, since she talks about it as much as she does butterflies.)
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She's right; the one drop rule is still the law of the land. I thought her answer was on point; especially since you're damned if you do and damned if you don't with regard to ethic identity in the US.