unions

Coal labor went Trump in 2016 because Hillary said "I'll pay to retrain you in something that won't kill you" and Trump said "I'll put you back in the coal mine". They wanted the latter.

Unfortunately, it's actually important to understand (not assume, but actually accept) that they are stupid and find a way to win their vote anyway. They want to work a Black Lung job because they're afraid to get free education to do another job they're not sure they can handle. So how do you win their vote without actually promising to put them right back where they came? Extra points - they are "too proud" for direct government assistance as well.