And by how frenzied they get when the man's name comes up in conversation.
Andrew Breitbart? Just the mere mention of his name ...
Alec Baldwin Calls Andrew Breitbart 'A Festering Boil on the Anus of Public Discourse'
So frenzied, in fact, they make no sense. Public discourse ... has an ...?
Discourse ("an exchange of views on some topic") is so much more agreeable and acceptable if everyone who is doing the discoursing agrees with Alec Balwin.
The moral of this story: You don't have to be coherent ("capable of thinking and expressing yourself in a clear and consistent manner") to be liberal, but you do have to be loud and obnoxious.