For the past four years, Biden has never completely reconciled with his choice. It is a decision that Obama and his chief helpers helped him consider that Biden had taken care of his son's death Beau and Obama had already promised his support to Clinton.
Instead, during a handful of conversations in recent months close to both men, obama has been listening as the bite explained why he believed he was uniquely suited to attempting to stop re-election of President Donald Trump. They talked about family problems. People who were conversant with the conversation said Obama is more like a close friend than a former president.
He would never tell Joe that he did not run, an Obama confidant said and spoke on condition of anonymity to discuss private conversations. "Does he think Biden will win the primary? He doesn't know the answer more than the rest of us do."
A challenge to Biden will be whether he is seen as Obama's righteous heir, or whether this position belongs to a recent figure in party. It will only become clear after the democratic primary fighting poles.
One thing Obama knows? Endorsements rarely work – even from a former president, who is one of the most popular figures in the Democratic Party. And Biden didn't ask directly to know well, he must win this primary blow on his own.
"I asked President Obama he didn't join and he didn't want to, "Biden told Delaware on Thursday. "Anyone who wins this nomination should win this at their own profit."
While Obama and Biden have been told to describe as an "unusually close" friendship, they actually only speak sporadically by telephone and face-to-face even less frequently.
Although some former members of the Obama administration have wondered highly about the vision of a Biden candidacy, Obama has been reluctant to criticize his former Vice President himself in his private talks.
Obama has met almost all of the Democratic presidency's hopes in recent months, but his discussions with Biden were far more personal in nature, say people familiar with the talks because he knows Biden and his family more intimately. But Obama was less of a sound card for a potential candidate for Biden, as he was for some other candidates.
In fact, Obama was largely enlightened by Bid's plans through their respective helpers, especially because their eight-year record in the White House will suddenly become the front-and-center of the democratic primary. And Obama made it clear in a rare statement from Thursday's office that he liked Biden very much.
"President Obama has long said that the election of Joe Biden as his companion in 2008 was one of the best decisions he had ever made," said Katie Hill, an Obama spokeswoman. "He trusted the Vice President's knowledge, insights and judgments through both campaigns and the entire Presidency. The two forged a special bond over the last 10 years and remained close today."
The relationship between president and vice president is by their own character, complicated.
Obama and Biden have in all contexts a much stronger bond than any new White House Partnership, given the tensions between George W. Bush and Dick Cheney and the turmoil between Bill Clinton and Al Gore in their last term.
While Biden earlier described this month as an "Obama Biden Democrat", it was remarkable that he did not once mention Obama in his advertising video on Thursday. Instead, he focused on the president at the moment in the Oval Office.
"If we give eight years in Donald Trump in the White House, he will forever and fundamentally change the character of nationality, who we are, and I can't stand it and see it happen," said Biden. "The core values of this nation, our standing in the world, our very democracy, everything that has made America America at stake."