A friend sent me this video this morning, telling me she was informed by male progressive activists that it was definitely Hillary Clinton behind it. (Because vaginas?) Even though it's connected to a PAC run by Martin O'Malley supporters.
Now, that isn't how campaigns work, and I've been saying this for weeks. Hillary Clinton is WAY out in front; you don't go after another popular candidate if you still have something to lose, and the only person who has anything to gain by trying to dirty up Sanders is Martin O'Malley.
The theory is that he is her attack dog and future VP -- even though most people believe it will be Julian Castro. But that would be too inconvenient for the conspiracy theorists, so.