Right now all of this is speculation... well informed speculation, though. I'm suspending judgement until the full truth is out there. So far I've heard Lewy's Body Dementia, frontal lobe dementia, Parkinson's, and a host of other armchair diagnoses. I won't be surprised if some armchair "doctor" says he has neuro-syphilis from Dr. Jill.

But it's the White House's own secrecy around this matter that is causing all the speculation and "diagnosis" guesses.