I thought your article was very well written. You make good points.
The cynic in me can't help pointing out:
"If moveon.org wishes to see it's momentum grow and be a long term political body, they will need to do better than just staying within technical legal boundries despite the wishes of the speaker used in the ad and be more professional in their approach to the accuracy of the actual advertisements, even on the most technical and taken for granted levels."
Maybe if MoveOn.org DOES want to be a long term political body (GOP, DNC) they SHOULDN'T do better than that. It's worked for the previously mentioned organizations.
I'm also a MoveOn supporter, have been a member for over a year now. Of course, I don't agree with everything the organization does, it sometimes seems like they're actively looking for causes, I support them wholeheartedly, and would proudly tout my membership to anyone who asks.
And you're right. We should hold ourselves to higher standards, because no one else will hold us to them.