In an explosive new book, noted historian Nancy MacLean exposes the billionaire-funded campaign to upend democratic governance. Her controversial argument centers on one man: James McGill Buchanan. According to MacLean, it was Buchanan who, funded by the Koch brothers, devised the blueprints for a libertarian takeover of American politics. She joins us Wednesday to explore the radical right's plan to eliminate unions, suppress voting, privatize public education, and rewrite the Constitution.