I know WV went for Juan McCain in ‘08 and I believe for Romney in ‘12. Probably KY as well. Maybe not union-miners personally, but the states went (R) so even if the miners voted for The Won, it ended up not doing any harm.
OH and PA did go for O, but it was the cities in both cases that did it for him, which is not where miners tend to live.
Union miners voted for Obama because anyone on unemployment and welfare needs Democrats. Since Obama lost in the coal contry, I’d doubt many non union votes. A map that was published in the Guardian showed the counties in which active mines are located indicate majority republican support. For anyone who has followed the UMW, that’s remarkable.
I wish there was a different system in place for carrying the electoral votes in an election The big urban cities override the majority of voters in the states - for instance, here in Ohio - Franklin, Hamilton and Cuyahoga counties are heavy Democrat, which means the entire state goes for zero. This needs to be changed.