I'm old enough to remember 1968. In the United States, it was a presidential election year. A president, Lyndon Johnson, rendered himself unelectable by pursuing an unpopular war policy opposed by a rising youth movement.
Johnson gave a televised policy speech on the Vietnam War on the evening of Sunday, March 31, 1968, and announced that he would not run for re-election. It may have been a coincidence, but on the East Coast, at least, Johson's speech pre-empted a show that was very vocal in its opposition to the war: "The Smothers Brothers Comedy Hour" on CBS.
