Biden's win came as voter turnout rose 7% over 2016, resulting in a total of 66% of U.S. adult citizens casting a ballot in the 2020 election, the Washington, D.C.-headquartered center said. Biden's popular vote differential was also better than fellow Democrat Hillary Clinton's 2016 two-point advantage, according to the fact tank.

Election results in the battleground states of Arizona, Georgia, Michigan, Nevada, North Carolina, Pennsylvania, and Wisconsin will be critical.

All eyes will be a small number of key "swing states" for the 2024 presidential election, some of which are in the Midwest.