Which Southern states could trend D in the next 10-20 years?

[Skill and Chance]

Pretty much all of the states on this list will, except for WV and probably but not certainly KY.  However, I doubt it will be enough to make any of them competitive in federal elections under normal circumstances.  Dem Gov upsets may become increasingly common, as we saw in LA and KY, and the local GOP will no longer be able to run with the certainty that any candidate they put up will win, as we saw in the AL-SEN special.

[Skill and Chance]

Pretty much all of the states on this list will, except for WV and probably but not certainly KY.  However, I doubt it will be enough to make any of them competitive in federal elections under normal circumstances.  Dem Gov upsets may become increasingly common, as we saw in LA and KY, and the local GOP will no longer be able to run with the certainty that any candidate they put up will win, as we saw in the AL-SEN special.

Arkansas?

I should have added it to the up in the air list with KY.  I think AR-02 and AR-03 will move left while AR-01 and AR-04 move right.  Either way it won't be interesting anytime soon.