25% of Dems back Huckabee over Clinton in 2016, in this poll. I wonder what that number would be in, say, West Virginia (or Arkansas?).
A lot of those "dems" in the South identify and are registered as Democrats, but haven't voted for Democratic candidates for decades due to the years of Democratic dominance for the region. For example, Oklahoma still has more than 31,000 more registered Democrats than Republicans, yet it's one of the reddest states in the nation, so I wouldn't read too much into that 25% of dems supporting Huckabee.