I've just noticed this website for Drinking Liberally.
An informal, inclusive progressive social group. Raise your spirits while you raise your glass, and share ideas while you share a pitcher. Drinking Liberally gives like-minded, left-leaning individuals a place to talk politics. You don't need to be a policy expert and this isn't a book club - just come and learn from peers, trade jokes, vent frustration and hang out in an environment where it's not taboo to talk politics.
Bars are democratic spaces - you talk to strangers, you share booths, you feel the bond of common ground. Bring democratic discourse to your local democratic space - build democracy one drink at a time.While I'm not necessarily advocating or commending this group, it looks interesting. The local chapter meets at the Rock Bottom Brewpub in Arlington, VA.