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Major Major's The Ride of the Foxleys has this, what with FDR incapacitated, a triumvirate as a regency, and Truman v. Dewey being complicated by Wallace's third party run and a bunch of bigots in the South and in California pledging themselves to Theodore Bilbo and Charles Lindbergh, respectively.
There's a Changing the Times scenario, The Guns of November, where 1968 is fought between Hubert Humphrey, Richard Nixon, George Wallace, and Walter Cronkite/Jesse Jackson on a leftist ticket. And it leads to the Joint Chiefs of Staff seizing emergency power.