Identity politics there Raoul
Didn't Bernie crush Hillary in the primary there? (Might be misremembering.) that suggests to me that a populist left candidate running in WV would garner more support than a corporate centrist. Sure they might not win the moderates but that primary suggests to me it could galvanise people who don't often vote-I think you've said in this thread that's a market to tap into. Don't forget too Trump used a lot of leftist stances (as lies) when he went to places like that, especially economically, talking about ending NAFTA. That part of the Venn diagram intersects with the populist left view, only they mean it.
If you're on the left and running there, you push it as a workers and jobs agenda surely.
I believe he did do well in WVA, which was partly down to him and his unique message and partly down to the fact that right leaning states generally can't stand either of the Clintons. WVA also happens to be the state that has the highest Trump rating (61%) so I'm not surprised that Trump and Bernie would to varying degrees be competing for the same voters.