Continuing the current trend (EDIT: that Excelsior just broke, nvm), here's my attempt at a c. 2014/5 list:
-2017:
Barack Obama (Democratic)
2017-2021:
Hillary Clinton (Democratic)
'16 (with Julián Castro) def. Chris Christie (Republican)
2021-2025:
Lindsey Graham (Republican)
'20 (with Adam Laxalt) def. Hillary Clinton (Democratic), Rand Paul (Libertarian)
2025-2033:
Kyrsten Sinema (Democratic)
'24 (with Amanda Renteria) def. Lindsey Graham (Republican)
'28 (with Amanda Renteria) def. Dan Patrick (Republican)
2033-:
Amanda Renteria (Democratic)
'32 (with Coleman Young II) def. George P. Bush (Republican)
The Clinton administration was defined by its crises. Though the MERS outbreak technically began before her inauguration, it occupied much of her first year in office as she tried to backstop the insurance industry and establish a federal standard for infection control measures, the latter despite the opposition of a not insignificant wing of the Republican party. [1] Next there was the Second Korean War, won at great cost by NATO and the Republic of Korea, and the Baltic Crisis. The Republicans nominated Lindsey Graham, on the line that when the Third World War happened Hillary could not be trusted to manage it competently; anti-war members of both parties, meanwhile, flocked to the Libertarians, who nominated Rand Paul as their standard-bearer. Paul won Colorado and split the vote with Clinton everywhere else.
But when the war ended up being a damp squib, particularly after the 'Russian Spring' put billionaire Mikhail Khodorkovsky in office, the Graham administration seemed to founder. On domestic politics it was, certainly, not the Tea Party - the American people would never tolerate that. But it was all a bit square - slow to adapt to the new multiculturalism, while at the same time deeply dissatisfying to the shrinking but still massive evangelical contingent. Former Virginia Governor Dave Brat won only two states in the 2024 Republican primaries, but it was enough to prove that the right wing was growing dissatisfied with the Graham presidency.
Meanwhile, the Democrats were preparing to nominate their first woman President - and, for that matter, their first President from anywhere west of Texas. The two candidates of the Clinton wing of the party, Governor Amanda Rentería and Senator Tulsi Gabbard, split the vote, allowing the more radical Senator Kyrsten Sinema to win the eventual victory; Sinema duly picked Rentería as her running mate, and proceeded to finish the job of adapting the Democrats to the new world order. Her dovish, cosmopolitan sensibilities and thoroughgoing liberalism helped the party appeal to the newly dominant Generation X and Millennial contingent within the party, and to a country that for the first time was majority-minority. As in 2016, demographics really were destiny...
[1] Convergent? Maybe, but consider that the Ebola crisis was one of the biggest stories of 2014, and that the far-right had established their willingness to flout regulations as early as the Bundy standoff. I don't know that one would have been able to predict the sheer scale of the political divides over a pandemic, but I do think it would have been very easy to predict that a) a pandemic was going to happen b) states would get into pissing matches with the feds about it.