Apparently there about half a dozen posters on that thread who claim to be doctors, nurses and social workers who parrot the same crap as the OP.
Well, I've got 23 years in nursing, the last seven specializing in dementia, and I can say unequivocally that they're all full of shit. From my observation there is absolutely no overt symptomology in McCain that would indicate the changes in cognition, behavior or personality that are related to Alzheimer's or any other form of dementia. Anyone with even the most rudimentary training in developmental psychology knows that none of us are "the same person we were eight years ago", or the eight years before that, or the eight years before that, and so on. It's called "growth" or "maturation" or "passing through the developmental stages", what have you. In fact, I'd go as far as to say that if you are the same person you were years ago without the subtle changes that normally resulting from learning, life experiences, maturation, and so forth, then that is more indicative of a pathological mental state than those who do demonstrate change.
Further, I'd state that these self-proclaimed "professionals" in the healing arts who immerse themselves in a hate-filled community like DU then cynically declare their expertise while making false diagnoses of their enemies for political purposes are totally devoid of ethics, a disgrace to their professions, and have no business in the healthcare community. I can only hope that they're lying about their credentials, which would be in no way surprising.