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I've lived for years in the Northeast, West coast, and deep South at various times in my life, and have observed and experienced the unique bigotries of each of those regions. I can say with confidence that Mississippi and other states of the deep south are still very racist on a person-to-person level, even if the racist laws have been struck down and the racist institutions largely abandoned. It is not at all surprising to me that the final vote would be so polarized along racial lines, even amongst the Dems. I don't think this can be seen as a harbinger of things to come in the general election. This is indicative of a region (maybe other regions I'm not as familiar with, too, but the evidence of previous primaries doesn't really seem to support that), not a trend to be concerned about nationwide. Not after just the one state of MS, anyway.