text:  They do say, I'm not a medical doctor, but they say people that have dementia doesn't happen overnight. They have good days and bad days. And sometimes I've been, I was at a White House correspondent's speech over a year ago, I think he started at 9 or 10 o'clock and went on for almost an hour. And frankly, I think he did pretty well. He didn't flub any words, just some minor things. He seemed to be pretty coherent the whole time.