The 1987 Robin Williams movie Good Morning Vietnam was loosely based on the story of Adrian Cronauer, a radio deejay in Saigon. The project was started in 1979, but delayed for almost a decade because America wasn't yet ready for a comedy about the Vietnam War. Meanwhile, Robin Williams became involved and ran with the project. The finished movie was less Cronauer and more Williams, but it was a big hit. Cronauer was ready to supply a sequel, also based on his life.
The real-life Adrian Cronauer – who Levinson had kept Williams apart from until the film had been shot – still had much story to tell. As such the follow-up film would have followed him as a journalist, this time at the Democratic National Convention in Chicago. It would have been set in 1968, and the proposed title was Good Morning, Chicago. The political setting was particularly interesting, given that Adrian Cronauer has described himself as “a lifelong card-carrying Republican” who campaigned for the likes of George W. Bush.
Furthermore, the 1968 convention saw a clash between 10,000 anti-war demonstrators and 23,000 police and national guardsman. Violent clashes ensued, including an infamous police assault in front of the Hilton hotel, on August 28th, 1968. At the convention itself, serving vice-President Hubert Humphrey was endorsed as the Democratic candidate for President, and he would lose the eventual election to Richard Nixon.
It was against the background of the event that Good Morning, Chicago was to be set.
Read more about the sequel that never was at Den of Geek.