Joe Biden's decision to end his reelection campaign on Sunday followed a series of strategic missteps by his campaign team and White House aides that amplified concerns that the 81-year-old president wouldn't be able to win in November's election, or run the country for another four years.
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.
These were some of the key moments that led to Biden's downfall.
THE DEBATE COUP: April to June
Biden himself set the debate in motion, after he told radio show host Howard Stern in April that he'd debate Trump, despite worries from some of his Democratic allies that a debate might do little to improve his chances or even cast an unflattering light on him.
Some Biden aides thought they had scored a coup in agreeing to a June debate. They worked with broadcaster CNN to shape the rules in what they thought was their favor and agreed on May 15 to two debates, including the first on June 27.
An earlier debate would serve Biden well, some aides thought, convincing voters that there was no other anti-Trump option in the race, but also cushioning the blow of