He's great for that kind of stuff. Here's a little bit of his background. I doubt he'd of lasted if he was too "sweet, little and old:":-)

From Wiki:

During the Kennedy Administration, Moyers was first appointed as associate director of public affairs for the newly created Peace Corps in 1961. He served as Deputy Director from 1962-63. When Johnson took office after the Kennedy assassination, Moyers became a special assistant to Johnson, serving from 1963–1967. He played a key role in organizing and supervising the 1964 Great Society legislative task forces and was a principal architect of Johnson's 1964 presidential campaign. When Walter Jenkins resigned from Johnson's staff in October 1964, Moyers became the President's informal chief of staff until 1966. From July 1965 to February 1967, he also served as White House Press Secretary.[3] In the New York Times on April 3, 1966, Moyers offered this insight on his stint as press secretary to President Johnson: "I work for him despite his faults and he lets me work for him despite my deficiencies."[4][5] The details of his rift with Johnson have not been made public, but may be discussed in a forthcoming memoir.[6]