Here is what I think happened.
Knowing that he was really, really, really going to be toast after the 1:00 press conference – John Atkins put pressure on some big R’s and reiterated his threat to clean out the GOP’s skeleton closet, basement, Raider’s of the Lost Arc-type storage facility.
Presto! No press conference.
UPDATE: Then again… maybe Nancy is right in the comments. If Gilligan and top Dems on the ethics committe decided to throw a last minute legal curve ball in order to keep Atkins write in campaign viable – then I’d have to say that they were being scumbags. I guess we’ll know in the fullness of time.