 And I will not accept the nomination of my party for another term as your president. That was in 1968, and that president was Lyndon Baines Johnson. So how does that historic moment compare to what happened yesterday when President Joe Biden announced that he would bow out of the 2024 presidential race? Jill Lepore is a professor of history and law at Harvard University and a staff writer at The New Yorker, and she's with us now to talk about all this. Good morning, Professor.