Let me go one step further.
If Trump keeps the coal miners demographic and captures the union demographic, which I think he is bound to do, the Democratic party will be fractured seriously.
That leaves the Republican libtards warring with the Trump Republicans about immigration, health care reform and other matters.
Almost all of the coal miners voted for Trump last November. Among the Union voters, right now it may be 50/50 (still much improvement from the 75%+ Democrat support witnessed among them a few years back).