alternatehistory.com

2017-2019: Donald Trump/Mike Pence (Republican)
2016: Def - Hillary Clinton/Tim Kaine (Democratic)
2019-2019: Mike Pence/Hillary Clinton (Republican/Democratic)
2019-2019: Hillary Clinton/vacant (Democratic)
2019-2021: Colin Powell/Joe Biden (Independent/Democratic/Libertarian --- National Union)
2021-202?: Joe Biden/Gary Johnson (Democratic/Libertarian -- National Union)
2020: Def - Jeb Bush/Ted Cruz (Patriot), Bernie Sanders/Elizabeth Warren (Progressive), Austin Peterson/John McAffee ("True" Libertarian)


(Yes this is unrealistic, it's deliberately so to mirror something else...)

Donald Trump's radical Presidency had caused a stir, particularly due to his unconventional relationship with Russia. When, on a hot summer's night in 2019, he fled the White House for a Maryland coastal town and then tried to bard a Russian Submarine, his true nature as a Russian Spy was revealed. The nation was thrown into chaos, and with much of the Republican Congressional leadership being arrested, Mike Pence was forced to appoint Hillary Clinton as his Vice President in return for the support of house Democrats, only for Pence himself to then be arrested and narrowly impeached. Clinton's Presidency was a disaster, and she quickly stepped down after appointing Colin Powell, the popular independent general, as her Vice President. Powell's National Union government allowed the country to slowly move back to stability, with the remainders of the Republican Party quickly emerging as the Patriots and the radical wing of the Democratic Party splitting off as the Prgressive Party and the Libertarians splitting over Gary Johnson's refusal to leave the National Union ticket. Even Trump's assassination in DC has not slowed the electoral process and Vice President Biden, who was mysteriously seen leaving the area of the assassination, is widely expected to win the Presidency...