I check /r/politics a few times a week (and /r/conservative once or twice a month - they're a lot more predictable) just to get a basic idea of what they're focused on and the type of news they're reading. It can be a little painful, but I've noticed that there's a lot more socialist posting going on lately - in some cases people are even justifying their arguments with theory. It's definitely still lib HQ, but it seems like we've got the momentum.

But yeah, turn on NPR once in a while during your commute - it won't kill you, it will give you something to talk about with your lib coworkers and it will create openings to discuss socialist solutions.