Do you mean single-issue voters who say "I'm a Democrat because I am pro-gay marriage, even though I support these mostly GOP or Libertarian policies, but they are not nearly as important to me as equal rights for all genders"?
I have trouble understanding how this is related to the whole discussion. Are you replying to some implicit argument?
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?