Why isn't a "Right to Invest" rhetoric pushed by the right?

Something is quite strange about "Right to Work" legislation.  What exactly is "Right to Work" providing and to whom and why?  The rhetoric seems to be about people having the right to work for a company without joining a union who has negotiated terms with a company requiring union membership as a condition of employment for the job.  The unions have backed off and merely require membership dues and yet this seems to be too much because people say they don't want to support the union's political activities.

I have somewhat mixed feelings about unions.  I don't like unions, including trade unions, limiting who can do a job by criterion other than willingness to join the union and to perform up to standards.  On the other hand, I know the individual is at a disadvantage in employment negotiations for many jobs.  My idealization of the unions would be an organization who works to get the best wages possible for the people best suited to the job while finding ways to support members who are falling behind but have supported the unions in the past.  There's no way I can support a union's right to tell highly qualified individuals they can't work because they have under-qualified workers who need a job.

The issue doesn't really seem to be about right to work at all but about the right to control political spending by unions.  The notion seems to be that a laborer shouldn't be required to contribute a portion of the proceeds from his or her productive activities to political causes with which he or she disagrees.  I could almost buy that and agree if the same underlying principle applied to the proceeds of one's investments but it does not.

While some of us have inherited our wealth most of us have what we have due to our productive activities.  When we invest our money we are really investing a portion of our prior productive activities.  ShareholderActivist.com chronicles attempts to open up the political activities of corporations to their shareholders and how that languishes.  It tuns out people in power don't even want me to know, let alone control, how the proceeds of my investments are spent on political activities.

"Right to Work" appears to be political gamesmanship wrapped up in rhetoric surrounding a real issue.  It isn't about making sure the best person for the job gets hired.  It certainly isn't about making sure the person getting hired gets the best wages possible.  It isn't even about the principle of political spending being controlled by the individual funding it.  It's about party politics.