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 announcing his impending resignation, the night before. The January 22, 1973 broadcast of the "CBS Evening News" saw Cronkite break the news of the death of another notable American political figure: former president Lyndon B. Johnson. At approximately 6:38 pm Eastern Time, while a pre-recorded report that the Vietnam peace talks in Paris had been successful was being played for the audience, Cronkite received a telephone call in the studio while off camera. The call was from Tom Johnson, the former press secretary for President Johnson who was at the time serving the former chief executive as station manager at