Paul is an isolationist liberaltarian. He might be somewhat on the limited government side, but part of that is that he doesn't even recognize the valid role of government in terms of national defense and border security. He runs as a republican because he would not have a chance of getting elected if he ran on the libertarian ticket.
Oh, please. Saying that Ron Paul is "somewhat" in favor of limited government is like saying that a sailor who's been at sea for a year is "somewhat" eager for feminine companionship.