David McCullough:
Well, you also have to keep an open mind, because often you find it in a person, somebody who has something say.
When I was working on my Truman book, I interviewed one of his Secret Service guards. And at the end of the interview, I said — I thanked him very much, because he really gave me a lot of time, and it was infinitely interesting and valuable.
And I thanked him. And I said, particularly when I think about how many times you must have been asked these questions.
He said: "Mr. McCullough, I have never been asked these questions."
(LAUGHTER)
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