Yeah, anyone that falls for those worn out ideas that corporations only support ReBumLiCans is more foolish than a than a person that buys a house without a home inspection.
Just remember two important things -
Unions and Corporations don't vote.
Loyalty of a worker to a company is very small but loyalty to a union is very large because of the mindset of the worker - between the two it is the union that is the most dangerous in our political system.
They may not vote but they do have a heck of an influence on the voters within their own envirament...