Democratic 2020 US presidential candidate and former US Vice President Joe Biden. Picture: Shannon Stapleton/Reuters/African News Agency (ANA)

For a candidate who has struggled at times to get noticed on social media, Joe Biden finally got some online attention on Thursday – for better or worse.

First, the Biden campaign posted a video on Twitter that brutally took down President Donald Trump, suggesting he is the laughing stock to other world leaders. Then a heated back-and-forth with an Iowa voter quickly went viral.

Together, the moments generated a digital buzz that has often eluded Biden, whose campaign appeals most to traditional, older Democratic voters. Such attention has generally been enjoyed instead by some of his chief rivals in the 2020 Democratic presidential race.

The 77-year-old former vice president continues to lead among Democrats in national polls and has so far withstood challenges from US Senator Elizabeth Warren and others in the battle for the party’s nomination to take on Trump in the November 2020 election.

The normally affable Biden lost his composure at a campaign event in New Hampton, Iowa, on Thursday, sparring with a man in the crowd who questioned him about his role in the Ukraine scandal that has been dogging Trump.