JFK was kind of like the movie star James Dean, the best thing that happened to his career was that he died in the middle of it. If he hadn’t been shot, he would been a one term president on the level with George H.W. Bush.
JFK would have reelected in a landslide. Who was going to oppose him? Nixon? He was beloved by all but the war hawks, and there were not very many of those among the wee little people.