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to me was the author basically saying how glad she is that the first black man to be elected president does not have a wife who has a size 2 Jackie-O type of body or is actually a white woman (with a Jackie-O type of body).
Mrs. Obama is a fine looking mother of 2 kids & the author is very, very happy about that.
I personally think this is a very minor aspect of the coming Obama Administration that can certainly be commented on in Salon.