Are you aware that Larry Lessig was Eldred's lead counsel, and argued the case before the Supreme Court?
Are you aware that he was arguing in support of the First Amendment in that case, and his opponents were arguing against it?
His attacks on Citizens United are just another example of this. A pragmatic legal mind would see that there is nothing corrupt about a couple of amateur filmmakers making and advertising an amateur film about a politician. A creative legal mind would find a way to fight corruption without fighting the First Amendment rights of amateur filmmakers.