The 1960 election was stolen. This is a fact disputed by only the rarest Kennedy sycophant.
LBJ and the Chicago Democratic machine literally stuffed ballot boxes, even whole rooms of ballots, at will. Organized crime expected to be rewarded as a result of their participation (which included no federal action against their leaders).
JFK didn’t deliver on his part of the bargain—Bobby kidnapped Carlos Marcello, dumped him in Central America...Carlos made it back...issued the order “get that stone out of my shoe”...oh well...byebye JFK.
And for some wild reason, Republicans also think they need be “gentlemen”. That is why Nixon didn’t contest. They still insist to act like gentlemen, but these days that’s like trying to be a gentleman in a gladiator arena. Just gets you killed.