Became an embittered Never Trumper and endorsed Hillary. I heard part of some speech he gave a year or so ago, it sounded like he really went off his nut.
A real shame since he was great for a good stretch. Met him after a speech which was very funny he gave at a local university years ago. I have no idea what caused him to lose it. Endorsing Hillary would seem to negate much of his work for a few decades previous.