If you want more credible ‘what if history?’...about JFK - how about this:
“What if the corrupt DNC is discovered stuffing the ballot boxes in Texas (a few counties) - and in the Chicago area. JFK doesn’t succeed in stealing the election, and Richard Nixon becomes the nation’s 35th President.”
That ‘what if’ is more credible than some of the others....
Ooh, good one! No Pentagon Papers. No Ellsberg break-in or Watergate. Nixon wouldn't have had to spend time and political capital on ending US involvement in Vietnam, instead building a more Republican (and much cheaper) version of the War on Poverty, while increasing defense spending (while NOT fighting a war in Vietnam), and balancing the federal budget. In 1969 he'd have office in triumph and left the country in its best condition of the 20th century, receiving much of the credit for the successful Moon race outcome even if it happened under his successor.
Ronald Reagan won but one state (California) in the 1968 primaries -- but exceeded Nixon's vote totals from his ten wins. It's not unreasonable to see Ronald Reagan as Nixon's successor from 1969 to 1977.