The miners might claim their struggle isn’t a political one, but they are wrong. That the law acts as iron chains on the poor and working class but merely gossamer threads on the rich is a key characteristic of class society, and simply a natural outcome of gross inequality of power. As such, anyone taking issue with any aspect of this principle is being profoundly political.
The Democrats would have to be abject fools (or mere tools of the ruling elite) if they fail to take up this issue. (Which, of course, means there is a very good chance that they won’t take it up.)