http://www.nbcnews.com/politics/2016-election/donald-trump-supporters-boost-bernie-sanders-west-virginia-n571791
39% of Bernie Sanders supporters in the WV primary said they'd vote for Trump over Sanders in a GE matchup. Sounds like your standard Democratic party constituency in every other state across the nation, right?
Trump speaks to workers in ways that Clinton doesn't. After her recent coal industry comments, many WV miners fear that she won't protect their livelihoods. While Trump is a disgusting man who relies on hatred, his protectionist message is received pretty warmly by people whose jobs are rapidly being destroyed by neoliberalism.
Trying to move traditionally conservative voters to the left is a good thing. Because working class whites aren't going anywhere, trying to appeal to them by attacking the economic systems that oppress them is necessary.