 I will point out that Dr. Wilson was so impaired for the last year of his term, he could only get out of bed with assistants and sit in a chair. He may also have some cognitive limitations, but the physical ones were extreme. Ronald Reagan struggled during debates as early as 1984, and by the time he spoke at Reykjavik after his meeting with Mikhail Gorbachev, his own aides were very concerned about his cognitive abilities.