How Serious Is Castro's Condition?

Venezuelan President Hugo Chavez says his friend Fidel Castro is in a "great battle for life," but that he's optimistic about a quick recovery. Just what is Castro's condition? Have the media done enough to find out? What do we know about the man and his evolution into a dictator? Ann Louise Bardach, author of Cuba Confidential, has interviewed Fidel Castro twice and has just edited his letters from prison for Sunday's New York Times.