Some truths:
You will likely not see a labor union endorsing John McCain. John McCain will likely not talk much about organized labor. That is too bad, because conservatives have a lot to say about organized labor and how it could represent labor effectively in our economic system.
Some thoughts:
1. Organized labor, the concept, is protected under the First Amendment to the U.S. Constitution. Employees should be free to associate with other employees of the same firm for the purpose of collective bargaining.
2. Monopolies should be avoided in our economic system. Thus, a labor union that seeks to represent all widget employees in negotiations with several employers who produce widgets should not be allowed to do so because of the monopoly control on the widget-producing labor force.
3. Labor unions should represent employees in matters with the employees' employer, not the industry-at-large. Additionally, labor unions should not venture into the world of politics, generally. Employer-employee policy is proper turf for labor unions. Their view would add to the debate and should be heard. Outside this realm, however, is foreign to the labor union's purpose and should be avoided. To venture fully into politics is to turn a labor union into a political party. Perhaps this would be the desire of some, but certainly not the purpose of the labor union.