Black voters probably don't make up as large a portion of the electorate as middle-aged white women. However, the press has been astounded by the way that Obama has carried the black vote by 90% in most states since South Carolina.
Recently there seemed to be a demographic divide between the Clinton and Obama supporters: Obama has carried young voters (where by "young", I mean under 45), black voters, and the well educated / well off. Clinton has carried older voters (ie > 65), white women, hispanics, and unions.
In yesterday's Virginia primary, however, Obama won every demograpic group except white women, and I think that Clinton's only strong bastion of support was among white women older than 45.
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