Gerald Ford keeps his promise to not run in the 1976. Nelson Rockefeller seeks the nomination. Does he beat Ronald Reagan? And if he does, wold he have beaten Carter? What would have been the butterflies from a Rockefeller presidency?
Rockefeller would have no chance of beating Reagan in the 1976 GOP primaries. Even Gerald Ford--an incumbent president and much less liberal than Rocky--was insufficiently conservative for nearly half the Republican primary electorate that year. https://en.wikipedia.org/wiki/Republican_Party_presidential_primaries,_1976