African Americans have always been heavily concentrated in Southern states. Given their general preference for the Democratic Party, that makes the South's dramatic change in its partisan representation since 1990 all the more noteworthy.
Conventional wisdom doomed Harry Truman's re-election bid in 1948 by not one, but two third party challenges. But a deeper look at history suggests that those challenges might actually have helped Truman win.
While there is a growing progressive trend supporting vetoes of radical right-wing legislation, there is a definite backlash against centrist, populist, Blue Dog-style Democrats in North Carolina and all across the South.