She called me just prior to the inauguration," remembers Leroy Davis, a New York art dealer who served on Mrs. Kennedy's Fine Arts Committee for the White House. "She had heard about a Maurice Prendergast show at the Museum of Fine Arts in Boston, and though she didn't know much about him, she was intrigued. So I talked to her for quite a while and encouraged her to see the work. And when the show went to the Whitney in New York, I took her to see it." Several months later, in 1961, during the Kennedys' triumphant state visit to...