If trying to convince Nader not to run is censorship, then a awful lot of Democrats are busy right now trying to censor every Presidential candidate other than the one they like.

Bader is mixing behavior with speech, probably deliberately. People are trying to get him to avoid a certain kind of behavior (running for office). They're not trying to censor what he's saying.

I'd like to hear more about your ideas on what constitutes censorship and what doesn't. This seems like an area where there is much confusion. You're actually something of an expert in this area, right? What, in your view, is the defining characteristic of censorship?

Nader may actually believe that making conditions worse for the majority is a valid political tactic.
See notnader.com