When former US president Calvin Coolidge died in 1933, columnist Dorothea Dix asked, "How can they tell?" Coolidge was widely viewed as having "slept" through most of his presidency (1923-29). It is now generally recognized that Coolidge suffered from clinical depression which dated from the death of his 16 year old son in 1924. http://hnn.us/articles/9815.html Today depression is recognized as a treatable medical condition. But I wonder if the public would be informed if a US president was in fact receiving treatment for depression. It's a very demanding job which can take its toll on any otherwise fit person, even without a personal tragedy.