Is that a No-True-Scottsman argument or is there something subtle I'm missing there?
You confuse party affilation with political beliefs. It's a mistake that comes from living in a two party state and having a media that tries to convince everyone that red and blue are the two political beliefs that one can have.
It's very worthile to have a mental concept of political beliefs that goes beyond party affilation.
George Orwell would say that the media tainted the language in a way that makes it impossible to analyse political beliefs in your vocabulary.
I was thinking about the hazards of bad government, and wondering if there was a way for the LW community to do something to oppose them, and it occurred to me that we might be picking up the problem by the wrong end.
The usual way of thinking about political action is to start with one's political identity (progressive, libertarian, whatever), and that's likely to put one at odds with people who have opposed identities.
Instead, I believe there are projects which could appeal to rationalists across a wide range of the political spectrum. A couple I can think of are opposing the war on drugs and improving judicial systems. Any other suggestions?