Left to Work

You know, and this is going to sound strange coming from a guy who organized the largest theatrical shop in New York City (outside of the Metropolitan Opera) for a labor union, I'm actually fairly sympathetic to right-to-work.
Now, many people don't know what "right-to-work" actually means. If you ask a labor person they'll say "right to work for less", and if you ask an anti-labor person they'll just start ranting about socialism or some such.
Right to work means that there is a law in the state which says that the employer may not require you to join a labor union in order to be employed. It does not (and cannot) mean that you may not join a union (you have the right to collectively bargain in most industries as a matter of federal law, the states cannot void that.)
Note that I say the employer does not have the ability to force you to join a union. Most of the time people talk about this they say the union makes you join. You don't work for the union. You work for an employer. It's the employer which forces you to join*.
Union folks can get irritated that they organize a shop, they establish working conditions with an employer, and then some employees decide not to join the union, getting essentially a "free ride" off of the union.
That's true. And I say get over it. Make your union so awesome that people are willing to pay dues to be a member. If you can't do that, you don't deserve to be a union.
On the other hand it does indeed seem to be true that non right-to-work states have better wages. Whether that's a cause or effect of the states' not having anti-labor laws I don't know.
I suspect we're about to find out.

*You actually cannot be compelled to join a union. You can be forced to pay union dues but you can always be "core status" which means you pay the union for its collective bargaining but not any of its political activities.