(FILES) In this file photo taken on November 2, 2020 Democratic Presidential candidate and former US Vice President Joe Biden gestures after speaking during a Drive-In Rally at Heinz Field in Pittsburgh, Pennsylvania. - Pennsylvania officially certified Democrat Joe Biden's election victory in the state over Donald Trump on November 24, 2020, a day after the president agreed to a transition but stopped short of conceding. Governor Tom Wolf tweeted that the Pennsylvania Department of State had "certified" the results of the November 3 vote, after Michigan did the same on Monday."As required by federal law, I've signed the Certificate of Ascertainment for the slate of electors for Joe Biden and Kamala Harris," Wolf wrote. (Photo by JIM WATSON / AFP)