Wal-Mart is a great example of free market capitalism. As previously mentioned, they help foster an environment of dis-inflation, competition, and provide jobs for thousands that would otherwise be unemployed (or real estate agents and mortgage brokers). They also provide goods at prices that allow some of the most economically challenged families to live dignified lives(by global standards).
They are not asking employess to vote Republican. They are simply stating facts and educating employees. (Funny though, how when you understand, you end up voting Republican anyway).
To paraphrase an often referenced quote:
If you are young and not a liberal, you have no heart. If you are older and not a conservative, you have no brain.