This is based off of a President Forever Scenario I played, running as George McGovern in 1968.
George McGovern is extremely successful in winning the late primary states, especially after endorsements by both McCarthy and Kennedy.
Green - McGovern
Red - Humphrey
Blue - Favorite Sons (Young, Smathers)
Light Blue - McCarthy
McGovern, however, fails to make significant inroads in regards to the Democratic establishment, who do not look to kindly to his antiwar stance, while at the same time considering him too liberal to win in the general election.
Red - Delegation entirely supportive of Humphrey
Blue - Delegation Divided between Humphrey and McGovern (note: All those divided were by insubstantial margins. McGovern's best state was Idaho, were he got 34% of the Caucus vote.)
As a result, despite having won a majority of the primaries, and the primary vote, Humphrey is overwhelmingly nominated as the Presidential candidate for the Democratic Party.
Humphrey - 2073
McGovern - 550
Hubert Humphrey would pick Governor John McKiethan of Lousiana as his Vice-President (never have heard of him before). Richard Nixon had already quite easily captured the nomination from his opponents, and chose Senator Frank Carlson of Kansas.
This is the current polling map.
Hubert Humphrey (D-MN)/John McKeithan (D-LA) Democratic Party 39% 249 Electoral
Richard Nixon (R-CA)/Frank Karlson (R-KS) Republican Party 36% 131 Electoral
George Wallace (AI-AL)/Curtis LeMay (AI-CA) American Independent Party 18.8% 77 Electoral
Undecided + Tossup States 6.2% 81 Electoral
Now here is what you have to do, and I will do it myself eventually. Tell us what course you think the election would take. Would Nixon still triumph the way he did historically? Would Humphrey be able to win the election? Would Wallace succeed in throwing the election into the House? Would George McGovern, now likely embittered, run as an independent candidate? You decide.