There are three questions I'd ask about 1964: 1. Who is the Democratic VP nominee. 2. Who is on the GOP ticket.
1. Apparently Terry Sanford was on the top of Kennedy's list. 2. Hard to say, but Rockefeller seems the most likely. As for his running mate, your guess is as good as mine.
That may not have been enough in the South. Tensions, by this point, were rising.
What I'm looking at is a Republican that does as well as Nixon (who might be Rockefeller) and a segregationist candidate, either taking enough votes from Kennedy to though the South to Nixon, or get enough EV's to throw the election into the House.
I was wondering if Dirkson or Scranton (who did run) might emerge as a dark horse.