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 the urging of his executive producer Ernest Leiser, Cronkite and Leiser journeyed to Vietnam to cover the aftermath of the Tet Offensive. They were invited to dine with General Creighton Abrams, the commander of all forces in Vietnam, whom Cronkite knew from World War II. According to Leiser, Abrams told Cronkite, "we cannot win this Goddamned war, and we ought to find a dignified way out." Upon return, Cronkite and Leiser wrote separate editorial reports based on that trip. Cronkite, an excellent writer, preferred Leiser's text over his own. On February 27, 1968, Cronkite closed "Report from Vietnam: Who, What,