But more likely, he'd need to win 75% of the delegates from scheduled contests to win the nomination outright on May 19 with Sanders still in the race. Bernie Sanders has not suspended his presidential campaign.
Sanders instead reminded the press that he was "dealing with a f***ing crisis" - referring to the ongoing COVID-19 pandemic - and refused to provide details on the future of his White House bid as calls mount for him to drop it.
Following her exit, the Democrat nominee field officially narrowed to a two-man race between Biden and Sen.
Dennis Kucinich, a former Democratic congressman from OH, didn't officially drop out of the 2004 primary until just days before the party's summer convention, when John Kerry won the nomination.
Defying the coronavirus which has upended life, turnout was robust in both states, suggesting enthusiasm to defeat Mr Trump remains high among Democrats.
Mike DeWine to postpone the state's primary, on the grounds of preventing the spread of coronavirus, only delayed Biden's near-certain clinching of the prize.
"Let me say, especially to the young voters who have been inspired by Senator Sanders: I hear you".
In the three weeks since his blow-out win in the SC primary, Mr Biden has built an essentially insurmountable lead over his last remaining rival, Bernie Sanders. I know what's at stake.
She has consistently opposed USA intervention in Syria, going so far as to meet secretly with Syrian President Bashar al-Assad in January 2017 during Democratic President Barack Obama's administration, sparking fierce criticism from some in her own party.
"I think you've seen in the last week, certainly, that the vice president is going to put policy considerations ahead of political considerations", Dunn said. Sanders said last week that the trend showed he "won the ideological debate" but was "losing the debate over electability".
With the coronavirus pandemic forcing more states across the USA to postpone primaries and both candidates to halt public rallies and turn to virtual campaigning, Mr Sanders, the former front runner, is under pressure to bow out of the race and let Mr Biden focus on the November election fight against President Donald Trump.
Sen. Sherrod Brown (D-Ohio) said on MSNBC that he believed DeWine, a Republican, acted "in totally good faith", but expressed worry about "any precedent" the cancellation might set. But in the same gathering where O'Malley Dillon was introduced, she and Dunn told the staff they were shuttering the Philadelphia headquarters and all other Biden offices.
"The race for the nomination is over".