That doesn't sound like they identify as Democrats as a specific political -ism at all.
If they're registered to vote democrat mainly because of their position on gay marriage, and I'm guessing also a negative opinion of the Republican party, and describe themselves as Democrats if asked about their political views because it's a convenient answer, that's not really the same thing.
Is that a No-True-Scottsman argument or is there something subtle I'm missing there?
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?