If you're unfamiliar with the general idea, DBx's "theory" in this context is Public Choice Theory, which essentially says that governments are composed of people and people have their own interests as well as those of the organisation in which they are embedded, which helps explain the many stupid decisions such as protectionism that all governments make. Acceptance of this theory, of course, leads you to conclude that government should be minimised.
So if any of my dwindling band of left-wing (or of any political persuasion, but knowledgeable of politics) readers claim to know of any left-wing theory of government behaviour, do let me know in the comments.
* Today we have naming of parts. I recall this from school. Though I think that omitted the motto.
* Hayek vs Hobbes and the theory of law.