I know that Sonoma on Capitol Hill and it's sister restaurant Mendocino in Georgetown have a nice CA-based wine list. I've had lunch at Sonoma and really enjoyed it. Haven't tried Mendocino yet but have heard good things.
Perhaps you should also check out Proof. Huge wine list and great food (try the gnocchi and the cheeses). Their wine list can be found here: http://proofdc.com/menus.html