MARKETPLACE OF IDEASCato Institute, ostensible champion of free thinking, lets itself be bought and soldhttp://www.washingtonpost.com/politics/koch-brothers-sue-for-control-of-cato-institute/2012/03/02/gIQAHQ9XpR_story.htmlThe battle for control over a prominent libertarian organization in Washington has cast a spotlight on its highly unusual structure, which allows the nonprofit research