Did JFK, Jr. ever express any real desire to get into politics?
Either way, I think the possibility of having another Kennedy in the White House (plus the second political dynasty in U.S. history) is too good to pass up and Kennedy would win in a landslide.
There were conflicting reports, some said he was going to run (and win) the NY Senate seat, others said he was waiting to run (and win) the Governership of NY. But either way it was widely reported he had plans to enter into politics and ultimately attempt to follow in his fathers presidential footsteps (not just a wishful fairytale, he actually DID want to do that)
And like you, I think (and I'd say the same thing even if I didn't like the Kennedys) he would win in a MASSIVE landslide.