You have a campaign between Nixon and JFK. It goes down in history as the first political demonstration of how appearance trumps content in a TV environment (the presidential debate was declared won by JFK by those who saw it on TV, and Nixon by those who heard it on the radio), and a campaign that was infamous for the voting chicanery (particularly near Chicago graveyards). JFK officially wins, and Nixon decides to accept that rather than divide the country by fighting it.
So we get the first Roman Catholic president, youngest ever IIRC, the first one born in the 20'th century. Charisma and an attractive wife I will grant you, if you grant me a family with a tendancy to alcoholism and womanizing. JFK's primary pursuit was seeing how many women he could screw. Somehow he found time to bring us to the brink of nuclear war (the Bay of Pigs fiasco), triple the number of CIA missions, got us into Vietnam (and I don't think it is clear that he planned on getting us out of it), and is widely believed to have murdered his girlfriend, Marilyn Monroe. (Some think that Robert was responsible instead. Theories abound.)
Then he got murdered. Many think there is CIA involvement. If so, then he got his just desserts for what he had them do everywhere else in the world. But in any case it doesn't matter. He gets murdered. He is seen as a hero, and for decades to come he will be the great tragedy, cut down in his prime.
His death accomplishes something useful. The Civil Rights act is passed in sympathy. (Along with a rider for women's equality placed there as a joke by Southern senators when it looked like they would kill it. Certainly the idea of woman's lib was the last thing on JFK's mind, unless you mean liberating them of their clothes and/or virginity.) Lyndon Johnson comes to power. He then dives into Vietnam, and civil rights. And gets re-elected.
A few years later JFK's brother Robert comes to the public stage. He manages to make himself into a hero for millions of young adults. He milks it for all it is worth, then gets killed as well. Thereby guaranteeing that his followers will never become disillusioned with him. JFK's widow, being the good social climber that she is (she has class and is liked so we won't call her a golddigger) marries the richest guy she can find. And a few years later Ted drives off of a bridge, while drunk, and kills a woman. This derails any presidential hopes. He has since become an institution in the Senate who is noted (unsuprisingly) for drunkenness and womanizing.
So WTF is it that leaves people thinking that the Kennedy family is somehow great? Hell, even people who spent years demonstrating against the Vietnam War and the CIA can't seem to be bothered noticing JFK's role in both!
Puzzled,
Ben
PS To be fair, there is one Kennedy that I respect. And that is Caroline, who with Ellen Alderman has managed to make the play of conflicts in the US legal system seem interesting.