The episode takes place on a Friday afternoon, and when they get to Kelsey's Bar, an NBA game is on the television. The only time an NBA game would be played on a weekday afternoon would be on a holiday, and we saw Archie coming home from work.
The very brief speech given by President Nixon interrupts the Evening News. Unless the speech was of major importance, there would be no need to interrupt the regular news.
When the presidential address is concluded, Kelsey- instead of turning the television back to the basketball game- turns the television off, although Archie was told that there was money riding on the game.