On September 11, 1987, Rather walked off the set in anger just before a remote Evening News broadcast from Miami, where Pope John Paul II had begun a rare U.S. tour, when a U.S. Open tennis match was being broadcast into the time scheduled for the newscast. He was upset that the news was being cut into to make room for sports and discussed it with the sports department. The Steffi Graf-Lori McNeil tennis match coverage then ended sooner than expected at 6:32 p.m., but Rather had disappeared. (CBS Sports had finally agreed to break away immediately after the match without commentary.) Thus, over 100 affiliates were forced to broadcast six minutes of dead air. The next day, Rather apologized for leaving the anchor desk. The following year, when Rather asked then Vice President Bush about his role in the Iran-Contra affair during a live interview, Bush responded by saying, “Dan, how would you like it if I judged your entire career by those seven minutes when you walked off the set in New York?”
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Idiocy repeats itself.
Those were probably the only seven minutes of Dan's TV life when he wasn't lying to the American people. So... judging Dan's career based on those seven minutes of dead time would be an overdone complement.