This covers something interesting that I've noticed with Republican non-incumbent tickets since 1952, and that is that only 4 times since 1952 has the Vice-Presidential nominee been a current or former Senator (seems odd considering that one would expect a Senator to be the Vice-Presidential pick given that one of the few explicitly stated tasks for a VP is to be the presiding officer of the Senate, though that basically only comes into effect on breaking ties).
The GOP Vice-Presidential nominees by most recent position since 1952:
- 1952: Richard Nixon (Senator)
- 1960: Henry Cabot Lodge (UN Ambassador; was unseated in Senate by JFK)
- 1964: William Miller (Representative)
- 1968: Spiro Agnew (Governor)
- 1976: Bob Dole (Senator)
- 1980: George H.W. Bush (CIA director; twice unsuccessful candidate for Senate)
- 1988: Dan Quayle (Senator)
- 1996: Jack Kemp (HUD Secretary)
- 2000: Dick Cheney (Defense Secretary)
- 2008: Sarah Palin (Governor)
- 2012: Paul Ryan (Representative)
- 2016: Mike Pence (Governor)
By comparison, since 1952 the Democrats have given the #2 slot to a non-Senator only twice (former Peace Corps director Sargent Shriver in 1972 after Thomas Eagleton was dumped from the ticket, Representative Geraldine Ferraro in 1984)