Every time Planned Parenthood calls me for a contribution, which I invariably make, I try to talk to them about organizing folks and criticize the fact that their entire political effort is exclusively focussed on lobbying. Needless to say, this gets no response. They don't even have a "number" they can shuffle me off to.
My gut feeling about a lot of "left wing" non-profit groups is that the leadership is more interested in fluffing themselves up in their hands-clean middle-class positions than in organizing any major opposition to the right-wingers. Planned Parenthood is one example, but there are others.
Joanna