CBS Evening News a one-evening test broadcast on August 19, 1965, before permanently switching to the format on January 31, 1966. Cronkite's prime time special report, "Who, What, When, Where, Why", broadcast on February 27, 1968, ended with his declaration that the United States could only hope for a stalemate in Vietnam. It is often credited with influencing Lyndon Johnson's decision to drop out of the race for President. "If I've lost Walter Cronkite ... [I]'ve lost Middle America", he stated. Under Cronkite, the newscast began what would eventually become an 18-year period of dominating the ratings among the network evening news programs.
Walter Cronkite News" on September 2, 1963, when the show was expanded from 15 to 30 minutes, making Cronkite the anchor of American network television's first nightly half-hour news program. Cronkite's tenure as anchor of the "CBS Evening News" made him an icon in television news. During the early part of his tenure anchoring the "CBS Evening News", Cronkite competed against NBC's anchor team of Chet Huntley and David Brinkley, who anchored the "Huntley-Brinkley Report". For much of the 1960s, the "Huntley-Brinkley Report" had more viewers than Cronkite's broadcast. A key moment for Cronkite came during his coverage of John F. Kennedy's