I believe the issue here is the threshold where mental patients are added to the "mental defective" file for the NICS system to find and reject.
Question 11 f of the Form 4473 asks:
"Have you ever been adjudicated mentally defective (which includes a determination by a court, board, commission, or other lawful authority that you are a danger to yourself or to others or are incompetent to manage your own affairs) OR have you ever been committed to a mental institution?"
Since the school that banned Loughner was not a "lawful authority" on the matter, and because Jared didn't subsequently see a doctor to get a professional diagnosis - well, he wasn't legally barred from purchasing firearms.
Whatever Obama has in mind, it'll probably involve getting most if not all mental health records dumped into the NICS system - not just cases where people have been *adjudicated* as mentally defective. That will require revising the Privacy Act where mental health records are concerned.
I just based my prognostication on the fact that the AZ shooting was a high profile case where a demoRAT politician was whacked.
(Never mind that a Republican judge was actually killed...) :-(
One thing for sure: the Fort Hood shooting will be ignored.