As a 60s nut, it's interested me for a while about a Kennedy scenario like "Monica's Baby". Though really most Presidents seem to have had affairs, Kennedy and Clinton are the two most well known for doing so. In Kennedy's day, though, the media either was left unaware or among those who did know, there was a special agreement not to say anything, and thus the general public did not know. Thus, Kennedy did not nor would he ever have a scandal like what Clinton and later American politicians would have.
So what if Kennedy, in all his womanizing, impregnated one of his many mistresses?