Former vice president and presumptive nominee Joe Biden won the primary with 83.7% of the vote, one of his best results in the whole primary cycle and his best until then, earning all delegates and helping him to cross the necessary majority of 1,991 delegates and officially win the Democratic nomination three days later during the vote count.

[2] Senator Bernie Sanders, who had withdrawn from the presidential race in April but still competed for delegates, only reached less than 8%, his lowest result until then.

Maryland would have held its primary on April 28 as part of a regional cluster, the Acela primary, together with the five states of Connecticut, Delaware, New York, Pennsylvania and Rhode Island, but like Pennsylvania and Rhode Island Governor Larry Hogan postponed it to June 2, while the three other states selected different dates.

In the closed primary, candidates had to meet a threshold of 15% at the congressional district or statewide level in order to be considered viable.

[4][5] District-level national convention delegates were voted on by the voters during the presidential primary, with no need for an additional confirmation by partie bodies.