NEW YORK — Robert Caro receives the most interesting mail.
“I get letters, constantly, saying, ‘I see your book’s coming. I hope you’re going to prove in this book that LBJ did it,’ ” the award-winning and ongoing biographer of Lyndon Johnson said during a recent interview at his midtown Manhattan office. “Did it,” as in killed President John Kennedy.
“When I talk at colleges,” Caro said, “you can hardly have a lecture or a speech without one of the first questions being, ‘Are you going to prove that Johnson did it?’ “
Conspiracy theorists who hoped that Caro, perhaps the most hardworking of historians, would finally nail Johnson will have to look elsewhere.
In “The Passage of Power,” the fourth of five planned volumes on Johnson, Caro devotes more than 100 pages to the events immediately before, during and after Nov. 22, 1963. Nothing in his many years of research has made him suspect Johnson.



