By Vatican News
Delegates of the Democratic Party cast their ballots for Biden in an online poll on Tuesday night.
The vote was largely a formality, as he had remained the only candidate standing in the race.
The 4-day Democratic Party Convention is a largely virtual affair this year, due to the Covid-19 pandemic.
Former presidents Bill Clinton and Jimmy Carter appeared onscreen at the virtual convention to express their support for Biden.
Biden officially accepted the nomination with a brief expression of gratitude.
"Thank you very, very much from the bottom of my heart,” said Biden. “It means the world to me and my family.”
Biden will deliver his formal acceptance speech on Thursday at the close of the Democratic Party Convention.