When I asked union guys that question, they used to answer that without Democrats, they would be making even less money. The Roosevelt years mentality.
I had a guy tell me “Republicans never did a thing for the working man”. Whatever the hell that means.
If we had more candidates like Trump far fewer democrats would have continued being democrats for all these years. The Republicans have been stiffs who didn’t really care about growing their party, they only wanted money for themselves and the lobbyists.