The former US vice president has effectively been his party's leader since his last challenger in the Democratic primary, Bernie Sanders, ended his campaign in April.
Voters across the US were forced to navigate curfews, health concerns and National Guard troops after election officials dramatically reduced the number of in-person voting sites to minimize the spread of the coronavirus outbreak.
The endorsement came less than a week after Sanders ended his presidential campaign, which was centred around progressive policies such as universal health care.
US Senator Bernie Sanders has suspended his presidential campaign, clearing the way for rival Joe Biden to become the Democratic nominee to challenge Republican incumbent Donald Trump in November.
Leaders in Ohio halted the state's presidential primary over concerns about the coronavirus. Officials in Florida, Arizona and Illinois say they would move forward with the vote.
Among Democrat Joe Biden's possible choices are Senator Kamala Harris and Senator Amy Klobuchar, both former competitors in the battle for this year's Democratic Party nomination.
Democratic presidential candidate Bernie Sanders said he would stay in the Democratic presidential race despite a series of big losses to front-runner Joe Biden.
Democrat presidential candidates Bernie Sanders and Joe Biden abruptly cancelled rallies because of worries about the virus, and New York’s governor announced he is sending the National Guard to scrub public places.
Despite a hotly contested campaign to challenge US President Donald Trump, Biden and Sanders share common ground on a number of issues.
The Democratic Party’s presidential field, which featured more than a half-dozen candidates a week ago, transformed into a two-man contest.
Bernie Sanders, who has energised liberals and young voters, sought to pull away from the rest of the field, while Joe Biden hoped to ride a wave of momentum and endorsements to cement himself as the standard-bearer for the party’s moderate wing.
Only two were given a chance to speak on the topic during the latest debate and neither answer proposed a workable solution.
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