In fact, Ford was the very first appointed vice president. Previously, all vice presidential vacancies had been left vacant until after the next presidential election. His entire presidency was based upon the language of an amendment ratified in 1967.
So, let's pull the time discrepancy back a few years. They were already playing around with this stuff for the 25th amendment, so let's have them insert a line or two into the West Wing universe's 25th amendment. It would outline a shortened presidential tenure for any individual not directly elected to the presidency or vice presidency who used the line of succession to reach the highest office in the land (appointed vp, Speaker of the House, President Pro Tempore of the Senate, or anybody else listed in what would become Federal U.S. Code Title 3, Chapter 1 in regard to the line of succession).
Hmm. Alternatively, what if there was no 25th Amendment? Then, with no clear procedure in place for succession, Nixon's resignation could've sparked a constitutional crisis and required some fast and furious work to find a remedy, which might end up being a provision that would move the date of the election. That seems a simpler way to go.
However, I'd consider it more likely that they'd just add a special election in '74 and then just go ahead with the normal election in '76 -- partly because people are reluctant to break with long-established traditions, and also because I very much doubt that anyone would've wanted to pass up the opportunity to align the next presidential election with the Bicentennial. But I suppose it's vaguely possible.
Regarding the three month time frame to hold an election: The UK goes through a whole national election cycle (announcement of election day through to voting) in 30 days. I think we could get ours done in 90 days. It might not be easy, but it could be done.
Yeah, it could be done logistically, but my point was about whether it would be fair. If alternative candidates aren't given sufficient time to organize campaigns, develop platforms, raise funds, and publicize themselves and their messages, that gives an unfair advantage to the incumbent. America's a much bigger country than the UK, and it takes commensurately more time, money, and effort to mount a nationwide campaign.
We could also speculate that Nixon resigned or was otherwise removed a year earlier than in the Thisverse and an election was held in 74.
Let's see, how many fictional presidents did TWW postulate? In the Sorkin years, they didn't really establish anyone beyond Bartlet, but in the post-Sorkin incarnation of the show (arguably a different show with the same name), they established a couple of earlier ones in the episode "
The Stormy Present": Owen Lassiter, a Reagan-like Republican, and D. Wire Newman, a Carter-like Democrat. Newman was the last Democrat in the White House before Bartlet, and Bartlet followed a 2-term Republican. That suggests:
D. Wire Newman (D): 1979-83
Owen Lassiter (R): 1983-91
Unnamed (R): 1991-99
Josiah Bartlet (D): 1999-2007
Matthew Santos (D): 2007-?
(Going by inauguration dates, of course, not election dates. And I don't count Glen Allen Walken since his term lasted, what, two or three days?)
If the electoral schedule was changed in 1974, then there's room for one more single-termer in the list, and that might've been Gerald Ford.
Alternatively, there could've been a GHW Bush-esque president between Lassiter and Unnamed, making Newman the winner of the '74 election, but I'd rather not posit a single party having a stranglehold on the White House for that long. It's also possible that Newman followed Lassiter, if you ignore the Carter/Reagan parallels.
I think Nixon is the most recent real president mentioned by name in the show.
Hmm. If Newman =~ Carter, Lassiter =~ Reagan, Bartlet =~ Clinton, and Santos =~ Obama, then Unnamed would probably be akin to a Bush.