This a question that has been probing me for a while
Lets say that ether Nixon really stumbles like George Romney in the spring or that he is assassinated, with only Nelson Rockefeller in his way Regan might score the nomination.
As for the Democrats I think its going to be quite difficult, especially with the disaster the OTL convention.
Unlikely Scenario of both winning but they might have a shot given they did have the largest support bases from their own party.
Unless George Wallace drops out of the race and endorses Reagan I would think November 6th would be a very thin victory for Eugene, while many would see him as a radical he has a better cut than Humphrey because he was not connected to unpopular Lyndon..