The millions/billions of dollars that unions contribute to democrats have a lot larger voice in policy making than your vote does.
It’s true that, historically, union and dems go hand in hand. That being said, the dem party has moved into full blown socialism. There is, in the IBEW at least, a steady shift taking place. The old guys are being replaced and the membership is moving toward the right. Most of the union guys I know will stand flat footed and tell you they voted for Trump. I follow the IBEW FB page. It has moved more and more right to the point I’d say the majority are Trump supporters. Ppl are smart enough to realize that it’s a strong economy and job market that makes a strong union... not the other way around.
Life long conservatives like myself are becoming the norm instead of the exception.