2020: After an economic crash, Trump loses a landslide to Bernie Sanders. Kasich runs indy and takes some votes from Trump.
2024: President Sanders wins the biggest landslide since Reagan '84 against Mike Pence.
2028: Vice President *whoever* is elected by a comfortable margin over a weak GOP opponent. With the Sanders era causing whites to vote on economics over cultural issues, combined with the growing African-American population, the South starts to trend Democratic.
2032: The incumbent president, suffering from a bad economy, loses to a moderate Republican challenger from the north.
2036: The incumbent president, enjoying a booming economy, wins comfortably. Some areas trending away from the party flip.