The next West Virginia

[Nightcore Nationalist]

WV was a fairly blue state that went hard right in a fairly short amount of time, I'm not sure there is a good apples to apple comparison.

Iowa went from a lean blue state to a likely red state in just 1-2 cycles, and it's not inconceivable that Maine's next step is leaning red after leaning blue and being very blue before 2016, but that's all speculation so far. 

[BaldEagle1991]

Florida.

[One Term Floridian]

Hot take: Florida. Just took a really long time to turn into WV never going blue again mode

[If my soul was made of stone]

As Florida's native-born population slowly dies off and the seas encroach, it will most likely become a rump state like it was before the migration waves that made it big, and as deep-red as at least Arkansas, but I don't think it's quite past the point of any competition yet, much like the position of WV in 2000 (trends rearing their heads heavily but not yet at the event horizon for seismic change).

[Wormless Gourd]

Wisconsin
The rurals are extremely white and a surprisingly very low degree attainment. There was an estimate that if Wisconsin's demographics voted like the nation at large it would contain the reddest counties nationwide.
Example; Rock county is 93% white and 23% college educated and Trump won it 51-49. Counties with similar demographics are 60-40 or worse for Dems just about everywhere else.

[Wormless Gourd]

Rock county

Meant to say Columbia
Was reading from a spreadsheet