I don't quite believe the useful idiot theory...she was a career employee and as such, knew better than to pass info to a reporter. Johnson is not a useful idiot, he is a co-conspirator along with the rest of the VIPS group in the largest coup ever attempted against a sitting President by the CIA. Johnson and his cohorts actually published an
article encouraging CIA agents to leak. See the section: "A Call to Patriotic Whistleblowing".