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FILE - In this March 21, 1969 file photo, President Richard Nixon plays the piano as first lady Pat Nixon, former President Harry Truman and his wife Bess watch at the Truman Library in Independence, Mo. This is the piano Truman used to play in the White House and was presented to him as a gift by Nixon. Through the years, commanders-in-chief have turned musicians-in-chief, with varying results. (AP Photo)

Pat and Richard M. Nixon

Decades before he became known to some as "Tricky Dick," Nixon was the one penning nicknames (sweet ones) to his future bride in gushy love notes that reveal a surprisingly soft and romantic side of the man taken down by Watergate. (AP)