If I remember correctly there was a really interesting bit about neoconservatives (actual neocons not just the generic word for Bush-era guys we hate) all remaining leftists instead of becoming conservative like real life. Especially Jews like Norman Podhoretz, Irving Kristol, Donald Kagan would probably continue being various shades of red instead of shifting right in the face of continued Nazi oppression of Europe.
It woukd be an interesting dynamic on far left to have ideological hawkish leftists (neocons/“neocommunists”) argue it out with ideological dovish leftists like Michael Harrington. Then on the left side of the Democratic Party you could still have the strain of Cold War liberal interventionists like Niebuhr, Truman, Moynihan, Kirkpatrick against the “we have trouble at home” liberals like RFK, Eugene McCarthy, McGovern. It wouldn’t stop the writers from sucking off the blandest schmucks like Hubert Humphrey but it would at least give a little flavor to have the chaos of the real life Democratic primary in 1968 multiple times. Then the wholesum 100 peace libs would have to deal with Richard Daley siccing the water hoses on hippies cheering for the US to nuke Germany