Those are both things I see strong libertarian support for and little support outside the libertarian sphere.
I don't think that's true at all; I would say that most liberals right now, and much of the country in general, are in favor of at least some movement on both of those issues. Legalization of marijuana, for example, now has majority support according to recent polls.
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?