larry lessig teaches at harvard law school and made his reputation as an expert on internet law. he started the mayday super pac, raising millions for congressional candidates who vowed to fight the corrupting influence of money in politics. all but two of them lost, but the fight continues. welcome back. >> thank you. >> thanks for having us. >> chief justice john roberts takes a different view of corruption from the two of you. he says, quote, any regulation must instead target what we have called "quid pro quo" corruption or its appearance. the notion of a direct exchange of an official act for money." >> well, at the constitutional convention, the primary topic was corruption. the framers are sitting there in philadelphia, trying to figure out how to build the structures to allow this new country. and their real obsession was how do we, you know, we've seen what's happened in england, we've seen what's happened in world history. how do we protect against basically big money taking over representative democracy? and when they talked about corruption, they weren't talking about