The Pennsylvania state Capitol is seen, Monday, Dec. 14, 2020, in Harrisburg, Pa. Pennsylvania's 20 members of the Electoral College will convene in a nearby auditorium today to vote in the 2020 presidential contest.

WASHINGTON — Joe Biden has cleared the 270-electoral-vote mark to formalize his presidential victory with California's 55 votes.

The voting milestone came late Monday when California electors affirmed Biden's massive 5 million-vote win last month in the nation's largest state.

Pennsylvania on Monday cast its 20 electoral votes for Democrat Joe Biden, the native son whose win in the state last month cemented his victory over President Donald Trump.

The electors, primarily Democratic elected officials, also chose Biden's running mate, Kamala Harris, as vice president. The 20 electors were socially distanced in a cavernous auditorium near the Capitol, meeting there instead of on the floor of the state House because of the pandemic.

The 20 Biden electors included county, city and statewide elected officials, among them Attorney General Josh Shapiro; Scranton Mayor Paige Gebhardt Cognetti; Rep. Jordan Harris, the No. 2 Democrat in the state House; labor leaders; an elections lawyer; and a former state senator.

The Electoral College took on added importance this year because of President Donald Trump's refusal to concede he lost his race for reelection.