Professor Randy Barnett teaches constitutional law at the Georgetown University Law Center, where he directs the Georgetown Center for the Constitution. A former criminal prosecutor in Chicago, he argued the medical marijuana case of Gonzalez v. Raich in the Supreme Court before devising and leading the constitutional challenge to Obamacare. His books include The Structure of Liberty: Justice and the Rule of Law, Restoring the Lost Constitution: The Presumption of Liberty, and his latest, Our Republican Constitution: Securing the Liberty and Sovereignty of We the People. Follow him on Twitter @RandyEBarnett