Archivist of the U.S John Carlin stands behind a 1947 Harry Truman presidential diary, July 10, 2003, at the National Archives in Washington. Presidents from George Washington to Joe Biden have kept presidential diaries. In them, they confide in themselves, express raw opinions, trace even the humdrum habits of their day and offer insight-on-the-fly on monumental decisions of their time. It's where they may also spill secrets they shouldn't. (AP Photo/Rick Bowmer, File)
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