The idea that southern black people don't count as culturally or politically "southern" is strange. The reason they live where they do, and vote the way they do, is very intimately tied to the distinctive history of the south.
It's not that they aren't Southern, its that they aren't part of the trend. Democrats will continue winning black districts in the South for the foreseeable future. The Democrats' problem with Southern whites is a more interesting phenomenon.
Oh sure. That way of phrasing it, I have no trouble with.
