i don't know whether to call you professor, or comrade. >> senator i am not a communist. >> when all in starts right now. >> good evening from new york, i'm chris hayes, you know, congressional centers of colleagues are rare. and it makes sense. if you think about it. members of congress don't want to sit the president, potentially open themselves up to censure of their own. they are not generally in the business of policing each other's behavior. kind of a live in that live approach. that said, centers do happen. not very often, but from time to. time not by conduct but a member of congress is so outrageous, it requires formal condemnation. now before last night, this was the most censure, which is more than a decade ago. >> a dramatic moment, in washington tonight, you don't see this often, even over the course of a lifetime, the