Well, he is the Father to TWO POTUS (Joe Jr. and RFK) both of whom were two term residents of the White House, Joe beat the Nazis, RFK was the great tax cutter (down below 80%!) so his rep is pretty solid.
I'd actually be super interested to read a wartime history of American politics. I'd imagine basically every debate ends with "...and of course, the Reich must be destroyed."
Did pre-war involvement in groups like the KKK or expressing racist/fascist views ever become a political litmus test?