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 Tonight Show" hosted by Johnny Carson. The following night, Carson did a comic spoof of his on-air farewell address. As he had promised on his last show as anchor in 1981, Cronkite continued to broadcast occasionally as a special correspondent for CBS, CNN, and NPR into the 21st century; one such occasion was Cronkite anchoring the second space flight by John Glenn in 1998 as he had Glenn's first in 1962. In 1983, he reported on the British General Election for the ITV current affairs series "World In Action", interviewing, among many others, the victorious Prime Minister, Margaret Thatcher.