Mr Obama and Mr Biden developed a so-called “bromance” during their time in the White House together. Mr Biden provided unwavering support to his President and there is an element of nostalgia for the two among other Democrats. Mr Biden is now running on his own and has a slight lead in the national polls for the presidential election next week.
Then, last week, Mr Obama erupted onto his campaign trail to deliver a speech in favour of his former colleague in Philadelphia.
However, he has not just been speaking out in favour of a fellow Democrat.
Instead, he stepped into a much more engaging role which was once filled by Mr Biden himself.
Discussing Mr Obama’s latest series of speeches on the BBC’s Americast earlier this month, the BBC’s Emily Maitlis said: “We saw something that I don’t think we could have imagined this time a week ago.
“That was Obama himself becoming Biden’s wingman.
Barack Obama campaigning for Joe Biden
Obama has just joined the campaign trail for his former Vice President
“He was the funny man on stage, he was making the jokes, he was cracking the jibes.”
Ms Maitlis said it was “weird” to think of Mr Obama “playing the best man to Biden”, rather than vice-versa.
Mr Biden was known to be an incredibly loyal Vice President to Mr Obama during their eight years in office together.
Some Democrats were even left wondering if this year’s nominee would be able to transform his public image from being the perfect wingman under Mr Obama to an independent leader who can stand on his own.
Yet, with this speech last week, the former President allowed himself to take the role of the “wingman”.
Obama and Biden spent eight years together in the White House
Aside from bolstering Mr Biden’s image, Mr Obama also made cutting remarks about Mr Trump during his campaign speech — and zeroed in on the President’s recently discovered financial links to China.
Mr Obama said: “Listen, can you imagine if I had had a secret Chinese bank account when I was running for re-election?
“You think Fox News might have been a bit concerned about that? They would have called me Beijing Barry.”
Speaking on Americast, BBC senior reporter Anthony Zurcher commented: “You can almost sense the resentment in Barack Obama’s speech there.”
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Biden was Obama’s faithful ‘wingman’ for years
Obama slated Trump in his recent speeches
The BBC’s North America editor Jon Sopel claimed Mr Obama was also trying to “trigger” Mr Trump by talking about his supposed “laziness”.
He concluded: “It was a speech designed to get under the skin of Donald Trump.”
CNN speculated that Mr Obama has only just released his most scathing attacks on the President in the attempt to “make his voice even more powerful at a time he thought it was most needed”.
Tradition suggests that former presidents do not criticise the policies of their successors, but Mr Trump has slated Mr Obama on a number of occasions in the past — which seems to have led both men to think the gloves are off.
The Republican President even questioned Mr Obama’s US citizenship in the run-up to the 2016 election in an attempt to undermine his eligibility for office.
Key demographics for both Trump and Biden supporters
Mr Zurcher also claimed that the Biden campaign was using Mr Obama to entice a different demographic.
He said the campaign was “trying to get him to reach out to black voters, particularly young black male voters who didn’t vote in 2016”.
These voters are needed for the Democrats’ campaign in swing seats such as Wisconsin, Pennsylvania, and Michigan.
Yet, Mr Obama did the same thing for Hillary Clinton and went to Philadelphia before the election in 2016 — and it did not work.
Mr Sopel noted: “Barack Obama has done best in elections when his name has been on the ticket.”
It remains to be seen what effect Mr Obama could have on Mr Biden’s campaign.