Let’s hope Trump does not fall from the same fate. As far as Kennedy, I don’t think he would be welcome in the modern Democrat Party, and may have been a Republican if alive today. With all his other problems and weaknesses, JFK was far more conservative than anything in the Dim Party today.
Stalin and Mao are more conservative than half of the members of that benighted party.
I believe that when Kennedy was president, Reagan was a democrat, so you are probably right.