After Joe Biden and Kamala Harris both decline to run, Blanche Lincoln becomes the consensus establishment candidate...somehow. She beats a Marjorie Taylor-Greene/Lauren Boebert ticket in November.
Malala Yousafzai
Tomorrow all 9 justices of the Supreme Court spontaneously decide to retire. Biden appoints 9 fringe liberals in their places to appease the left. In the run-up to the 2024 Election the court takes a case about Duckworth's eligibility to be President. The court ends up ruling that any restrictions whatsoever on eligibility would violate the 3rd, 9th, 11th, 14th, and 21st Amendments. As a result, the non-American Yousafzai announces a run to make a political statement. After both major party nominees as well as the Libertarians, Greens, and Socialists are embroiled in simultaneous Roy Moore-tier scandals, Yousafzai wins with a plurality.
Greg Schmaltz, Mayor of Ruso North Dakota