Obviously the WP post would trust there own reporters, but MD4Bush posted, "Yeah, he cheats on his wife. I heard that he is not allowed in the house and is living in some new high-rise near city hall."
link which is libelous if false, and something that a WP reporter would not want to be caught doing. It is more likely MD4Bush was an operative known to some reporter at the WP or had sufficient credentials to credible to them for that reason.
MD4Bush was more than likely more than one person, and they targeted NCPAC from the start, the first post was to him.