alternatehistory.com

Here's a list of Presidents from @Fleetlord's excellent EG Washington Wouldn't Grant Couldn't, continued up to the "present day" (so about June 1976).

1933-1941: Franklin Roosevelt/John N. Garner (Democratic)
def. 1932: Herbert Hoover/Charles Curtis (Republican)
def. 1936: Alf Landon/Frank Knox (Republican)
1941-1945: Richard E. Byrd/Arthur Vandenberg (Republican)
def. 1940: Robert Maynard Hutchins/Tom Connally (Democratic)
1945-1949: Richard E. Byrd/Harold Stassen (Republican)
def. 1944: Franklin Roosevelt/Lyndon B. Johnson (Democratic), George S. Patton/L. Mendel Rivers (Independent "Victory")
1949-1954: George C. Marshall/Eleanor Roosevelt (Democratic)
def. 1948: Harold Stassen/John G. Winant (Republican), Fielding Wright/Owen Brewster (Victory)
def. 1952: Thomas E. Dewey/J. Bracken Lee (Republican), Harry F. Byrd/John S. Wood (Victory)
1954-1957: Eleanor Roosevelt/Vacant (Democratic)
1957-1961: Estes C. Kefauver/John Kennedy (Democratic)
def. 1956: Richard Nixon/Nathaniel L. Goldstein (Republican), Strom Thurmond/Clifford Davis (Victory)
1961-1963: Clare Boothe Luce/William H. Harrison II (Republican)
def. 1960: Estes C. Kefauver/John O. Pastore (Democratic), Herman Talmadge/Thomas B. Stanley (Victory)
1963-1963: William H. Harrison II/Vacant (Republican)
1963-1969: William H. Harrison II/Jacob K. Javits (Republican)
def. 1964: Chep Morrison/Edmund G. Brown (Democratic)
1969-1971: Jacob K. Javits/Robert B. Anderson (Republican)
def. 1968: John M. Campbell/Edward McCormack, Jr. (Democratic), Howard Jarvis/Thomas Anderson (Independent)
1971-1973: Jacob K. Javits/George Romney (Republican)
1973-0000: Emanuel "Mutt" Evans/Gore Vidal (Democratic)
def. 1972: Jacob K. Javits/George Romney (Republican)