You don't have to be insane or drug addicted to lead a nation, though it helps. Some of the most powerful politicians of the 20th century were unbalanced, depressive, alcoholic or even senile. This documentary series examines the psychological lives of a few of them and the constitutional mechanisms and subtle management techniques used to cope with such leaders. In the case of Ronald Reagan, whose presidency is examined tonight, it was early effects of Alzheimer's and the repercussions of an assassination attempt that marred his time in office. Elaborate attempts were made by aides to hide this from the public. We learn that on the morning after he was shot by a would-be assassin, for example, the delirious Reagan was given a piece of dairy farming legislation to sign, to give the world the impression he had complete control of his faculties even though he had lost half his blood and had recently emerged from a general anesthetic. The psychological angle of this documentary is great, though the delivery can be mediocre. We hear all about how many times Reagan fluffed his lines and forgot words, yet there is little footage of this.