Definitely the first person who came to mind for me when I read you post, it was him or Blair.
To be honest though, warnings about great orators are a bit of a cheat. Lost an argument? It wasn't that my ideas weren't as good as his, he was just such a great orator that his ideas seemed better...
Speech which is restricted goes underground where it cannot be subject to challenge.
You don't defeat bad ideas by silencing them, you defeat bad ideas with better ideas.