(This will probably be a recurring, mournful cry.)
…if I had superpowers, I would sterilize the entire Kennedy family tree before it hatches any more nuts. Yea, unto the third cousins.
Seriously, what good are they? What good have they ever been? Theirs is a family of monsters.
Yes, monsters. You’re familiar with the Mimi Alford book that recently came out? Among his other abuses of Mimi, JFK wanted her to give his lil’ brother Teddy a BJ. What kind of man would ask a women to s**k o*f Ted Kennedy?! No man ever could.
The only excuse for any Kennedy, Bobby included, is that they were warped as children by an even greater monster.
So…hmm. Let’s refine the daydream. My longed-for powers rarely include time travel, due to paradoxophobia. But dealing with the Kennedys would be worth it. So, time to coin a phrase! If I had superpowers…
…I’d be doing me some retroactive sterilization.
(UPDATE–wow, I’m staying stressed. Time to break out the big guns:)
World's Only Rational Man 
I’d abuse them and make myself God-Emperor of Mankind. And you’d all be my subjects.
There was a twitter trend like that yesterday or the day before. Most of it was the usual naive making the world better nonsense. Let’s face it, yeah, they would try to do that in the beginning. But on the long run everyone would abuse the power. Everyone. It’s just too tempting.
Ok, maybe some few individuals wouldn’t. Like Washington or Buddha. Both stepped back from power. But the rest? The vast majority? The 99%? They would all abuse it.
As for the Kennedys, please. It should be done via time machine. Go back in time, remove Joseph from the timeline before he has children. Clean and simple.
Would you create your own Golden Path, and your own Siona?