President Biden is framing the 2024 election as a fundamental choice about the future of freedom and democracy in the U.S., casting Republicans—who want to focus on the faltering economy and Mr. Biden’s age—as a danger to the nation.
Mr. Biden formally launched his re-election campaign with a video announcement Tuesday, a long-awaited declaration that puts him on the path to a potential rematch with the man he beat in 2020—former President Donald Trump. The 2024 campaign will play out in an era of political polarization, with both parties fighting over a small number of battleground states and the narrow slice of the electorate that isn’t firmly in one camp or the other.