Here's my Reagan in '68 list.
Ronald Reagan/George Romney (1969-1977)
George Romney/Paul Laxalt (1977-1981)
Lloyd Bentsen/Jerry Brown (1981-1989)
Howard Baker/Jack Kemp (1989-1997)
Jack Kemp/Dan Quayle (1997-2005)
Dan Quayle/Jeb Bush (2005-2009)
Mark Warner/Wesley Clark (2009-2017)
Failed Tickets:
(1968, 1972, 1976 no change)
1980: George Romney/Paul Laxalt, John Anderson/Patrick Lucey
1984: Paul Laxalt/Bob Dole
1988: Jerry Brown/Al Gore
1992: Paul Tsongas/Tom Harkin
1996: Bill Clinton/Bob Kerrey
2000: Joe Lieberman/Dick Gephardt
2004: John Edwards/Howard Dean
2008: Dan Quayle/Jeb Bush
2012: Rudy Giuliani/John McCain
What exactly did Bentsen do to cause five Republican terms in a row?
Nice list! It would make for an interesting TL.