Reading lists for potential presidents

Washington Post columnist Ruth Marcus reports:

Asked in an interview for PBS’s Charlie Rose show last year ( about her favorite authors, [Sarah] Palin cited C.S. Lewis — “very, very deep” — and Dr. George Sheehan, a now-deceased writer for Runner’s World magazine whose columns Palin still keeps on hand.

“Very inspiring and very motivating,” she said. “He was an athlete and I think so much of what you learn in athletics about competition and healthy living that he was really able to encapsulate, has stayed with me all these years.”

John McCain, Marcus notes, “is a voracious reader of history. The day before the New Hampshire primary, I sat on his campaign bus listening to him hold forth about William Manchester on Douglas MacArthur.”

Of course it’s reasonable to make the case that it’s less important which books powerful people read than the lessons they draw from those books.

Nevertheless, which books (fiction or non-fiction) and which authors do you think potential presidents should read? And why?