BBC:
This was Joe Biden’s first chance to define how he will be judged by history.
In a rare televised address from the Oval Office on Wednesday night, he spoke of his accomplishments. He spoke of his humble roots. He sang the praises of the American people. He said the future of American democracy lies in their hands.
What he didn’t do, despite saying he would always level with Americans, was provide a direct explanation for the biggest question of the day.
He didn’t say why he has become the first incumbent president to abandon a re-election bid, just a few months before voting begins.
And that is what the history books will be most interested in.
He hinted at it. He talked around it. But he never tackled it head on. It was left for the American people to read between the lines.
“In recent weeks,” Mr Biden said, “it’s become clear to me that I need to unite my party.”
He then echoed what has become a growing chorus among Democrats – that it was time to “pass the torch” to a new generation.
While he said his accomplishments, which he listed in detail, merited a second term in office, he added that “nothing can come in the way of saving our democracy – and that includes personal ambition.”
Left unsaid was the cold, hard reality that he resigned because it was becoming increasingly clear that he was going to lose to Donald Trump in November. And that is an outcome that those in his party universally view as catastrophic.
Trailing in the polls, embarrassed by a miserable debate performance and with a growing chorus in the Democratic Party calling for him to step aside, there was no clear path to a Biden victory.
While the president may not have said it, his Republican predecessor – and now former rival for the White House – had no such qualms.
At a rally in Charlotte, North Carolina, a few hours before the address, Donald Trump said Mr Biden dropped out because he was losing badly.
