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 unsure about how much of an impact his editorial report had on Johnson's decision to drop his bid for re-election, and what eventually convinced him that the President had made the statement was Bill Moyers, fellow journalist and former aide to Johnson, telling him "The president flipped off the set and said 'If I've lost Cronkite, I've lost Middle America.'" Several weeks later, Johnson, who sought to preserve his legacy and was now convinced his declining health could not withstand growing public criticism, announced he would not seek reelection. During the 1968 Democratic National Convention in Chicago, Cronkite was anchoring