Biden's halting performance at the June 27 presidential debate against Republican candidate Donald Trump, pushed even some of his closest allies to question whether he could endure a full campaign, and added gasoline to a smoldering Democratic party movement questioning the wisdom of his second term. Within days, Biden went from the party's figurehead to a liability. He became the first sitting president to stand down from a possible reelection since Lyndon B. Johnson in 1968.
