At the 1968 Republican Convention, Nelson Rockefeller and Ronald Reagan tried to build an alliance that would've stopped Nixon and created either a Rockefeller/Reagan or Reagan/Rockefeller ticket. However, neither man's campaign could agree to supporting the other in the top spot. Ultimately Nixon won the nomination and then the election.
Here is the POD: instead of withdrawing and then entering the race at the last minute, Rockefeller declares his candidacy in the spring of 1968 and wages a full-fledged effort to win the nomination. He scores early primary victories in the Northeast before winning in Oregon as he did in 1964. Nixon takes most of the Midwest while Reagan wins California, and ultimately no candidate has sufficient delegates to win on the first convention ballot. However, Rockefeller's candidacy is strong enough that he clearly leads Reagan and is able to convince the CA Governor to support him at the convention in exchange for the VP slot. The deal is made, and the Rockefeller/Reagan ticket is formed. Would they have won the general election against Humphrey, and if so what would a Rockefeller presidency look like from 1969 on?
Here is the POD: instead of withdrawing and then entering the race at the last minute, Rockefeller declares his candidacy in the spring of 1968 and wages a full-fledged effort to win the nomination. He scores early primary victories in the Northeast before winning in Oregon as he did in 1964. Nixon takes most of the Midwest while Reagan wins California, and ultimately no candidate has sufficient delegates to win on the first convention ballot. However, Rockefeller's candidacy is strong enough that he clearly leads Reagan and is able to convince the CA Governor to support him at the convention in exchange for the VP slot. The deal is made, and the Rockefeller/Reagan ticket is formed. Would they have won the general election against Humphrey, and if so what would a Rockefeller presidency look like from 1969 on?