...I'm not sure why this article is recieving so many votes. The very definition of a corporation reveals that it is not a libertarian concept.
"an association of individuals, created by law or under authority of law, having a continuous existence independent of the existences of its members, and powers and liabilities distinct from those of its members."
If contract rights are enforced, and individual rights are protected, then there is no need for something like a legal recognition of an independent entity such as a corporation. Corporations seem to have their value to business, but they also clearly have their unintended consequences.
HOWEVER, none of this has anything to do with how much political control they exert, or what harm the general public believes they create. To be honest, those points sound like nothing more than left wing class envy. If Walmart wasn't incorporated, and it was just regular folk running the business without the legal protection of corporate law, would it still be bad if those individuals donated to lobbyists or politicians? Would we despise them because many liberals think Walmart harms society? The fact that they are a corporation has nothing to do with it.
Free market capitalism isn't right for America because it works better. It's right because it's free (and it works better).