That's surprising. I would have thought at least one of either the 1st or the 4th would have blacks as a large enough proportion of the Democratic primary electorate to give Obama a clear victory.
On the face of it, those both results may seem strange.
However, if you figure out that the African American strongholds lie only in the Southern halves of either congressional district and that the Southern Arkansas counties are only sparsely peopled, the results become more plausible. Furthermore, there are only six counties which are majority black.
When you consider that someplace like Dallas Co has a black pop >40%, it just shows how many of the whites, who voted not just for McCain and Romney but also for Bush by what looks like 3-1 in 2004, are still voting in the Democratic primaries. The combed strength of Democrats both black and white draw even more people to the D primaries because that's where the action is. In the Northwest, the Republicans are stronger so I suppose those voting in the D primary are more likely to identify with the national party.
Thanks for the maps.
