Idiot producers don't know what a joke is
"I have just received the following telegram from my generous Daddy. It says, 'Dear Jack: Don't buy a single vote more than is necessary. I'll be damned if I'm going to pay for a landslide.'"
- John F. Kennedy
So the mini-series shows Joe Kennedy actually saying that he won't pay for a landslide.
JFK was making a joke you morons! It didn't really happen!