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FILE - In this June 5, 1960 file photo, former President Richard Nixon, left, and his wife Pat pose for photos while campaigning at Rockefeller Center in New York. Six love letters between the 37th president and his wife will go on display Friday, March 16, 2012 as part of an exhibit at the Richard Nixon Presidential Library and Museum. The exhibit is intended to celebrate what would have been Pat Nixon’s 100th birthday and is dedicated to her life and accomplishments. (AP File 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)