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Let's say Ford is assassinated in 1975 by Lynette Fromme and Rockefeller is President. Reagan proceeds to run against him in the primary and win handily.
Rockefeller (being a man with a lot of money and a lot of ambition) proceeds to run as an independent liberal candidate with his friend Margaret Chase Smith.
Jimmy Carter picks either John Glenn or William Proxmire as his running mate, seeking to double down on being an outsider candidate.
Reagan likely has California locked up and Rockefeller-Smith would likely play very strongly in the northeast. Carter has the South secured. It looks like it'd be a contest for the midwest, I think.