alternatehistory.com

I don't know where I went for this one.

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1981 - 1981: Ronald Reagan†/George H.W. Bush [Republican]
Jimmy Carter/Walter Mondale [Democrat], John Anderson/Patrick Lucey [Independent]
1981 - 1981: George H.W. Bush†/[vacant][1]
1981 -1982: Alexander Haig/[vacant][2]
1982 - 1983: Alexander Haig†/Howard Baker†[3]
1983 - 1983: George P. Shultz/[vacant]
1984 - 1991: George P. Shultz†/Robert McFarlane ["Wartime" Republican]
'84: [elections suspended]
'88: Pete du Pont/Clayton Yeutter ["Normality" Republican], Bill Clements/various ["Challenger" Republican], Thomas Foley/Daniel Ellsberg, Norman Finkelstein/William Blum [Independent/"Dove"], Linda Jenness/Jim Bohlen [Workers]
1991 - 1991: Robert McFarlane/[vacant] [4]
1991 - 1991: William Weld/Joe Paterno [5]
1991 - 2001: Tim Wirth/Mike Espy
'91: Joe Paterno/Edward R. Madigan, William Mandel/various ["McCarthy" Republican], Ray Metcalfe/Ronald Radosh ["Reform" Republican], Huey P. Newton†/William E. Forbes ["New Beginnings" (Dove-Workers-various)]
'96: Oliver North/Ed Derwinski, Tom Ridge/Nicholas F. Brady, Ronald Daniels/Andre Marrou
2001 - : Pete Domenici/Anne M. Gorsuch ["New Peace" Bipartisan Coalition]
Robert Rubin/Leon Panetta, Bill Frist/Michael Boskin, various minor parties

[1] Reagan assassinated by John Hinkey.
[2] Bush goes missing when Air Force one vanishes over the Atlantic. Sec. State Alex Haig is sworn in.
[3] Remembered as "the Butcher & the Baker", entice a nuclear exchange when NORAD suffers a malfunction. Marine One was struck by a shockwave and sent down before it could reach Cheyenne Mountain.
[4] Shultz is shot dead by a deranged protester while on the ground in Little Rock, Texas.
[5] Weld and the "Normality" Republicans make a 'quiet coup' to remove the totalitarian Wartime government, then force a snap election.