They know they can just say a few words of support for organized labor and how much they love them and they can get under votes and the support from the organizations no matter what. Because the alternative is always worse.
My home state of NC is a prime example of this. In the 1950's the state legislatures outlawed all collective bargaining contacts for any state or local government employee. As a result there are no real public sector unions at the state or local level. No teachers union, no police union, no fire union, no sanitation workers union, no union for workers in state or municipal owned hospitals. It's so screwy when Asheville got grants for its mass transit that required union drivers they had to privatize and contract operation of the transit system to a 3rd party who skims profits off so the union would be contracted with them and not the government.
Unions here are pretty much toothless "professional organizations" with no bargaining power and voluntary membership when it comes to any government sector but Federal employees.
And every year when Democrats talked about changing this for as far back as I can remember. And if they didn't have enough power to do it they talked big about it. When we help power all the way across to be able to do it, as recently as a few years ago, they never did it just talked a lot less about it because there wasn't a barrier to actually doing it.
When I've confronted Democratic lawmakers about I give been given a whole host of nonsense excuses.
But this year again they are talking big about what a problem that law is. I wish o could say I had confidence this time they meant it.