At least one failure mode is avoided if "political identity" is a mere descriptive classification of the aggregate of actual beliefs, but these beliefs aren't formed based on the opaque political identity label. Ensuring accuracy in these beliefs is a more ambitious goal than just avoiding this common fallacy.
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?