alternatehistory.com

Washington Wouldn't, Grant Couldn't, and Roosevelt Shouldn't: I'm Against a Lifelong Term
(1933–1941): Franklin D. Roosevelt / John Nance Garner (Democratic)
1932: Herbert Hoover / Charles Curtis (Republican)
1936: Alf Landon / Frank Knox (Republican)
(1941–1945): Franklin D. Roosevelt / Henry A. Wallace (Democratic)
1940: Wendell Willkie / Charles L. McNary (Republican)
(1945–1953): Franklin D. Roosevelt / Harry S. Truman (Democratic)
1944: Thomas E. Dewey / John W. Bricker (Republican)
1948: Thomas E. Dewey / Earl Warren (Republican), Henry A. Wallace / Claude Pepper (Independent Democrats)
(1953–1954†): Franklin D. Roosevelt / W. Averell Harriman (National Liberty)
1952: Harry S. Truman / Frank Lausche (Democratic), Earl Warren / Robert A. Taft (Republican)
(1954–1957): W. Averell Harriman / None (National Liberty)
(1957–1961): Wayne Morse / J. William Fulbright (Republican/Democratic)
1956: W. Averell Harriman / Estes Kefauver (National Liberty), Happy Chandler / J. William Fulbright (Democratic)

It's currently a WIP but the basic premise is that FDR continues to run for the Presidency until his party collapses under his leadership and he dies in 1955 infamously known as the man who destroyed the modern Democratic Party.