The Oval Office address is designed to be a comforting American ritual. Going back decades, the President, sitting behind the familiar Resolute Desk, faces a single camera and speaks directly to the nation. “My fellow Americans,” Joe Biden began Sunday night, his third time addressing the country from the Oval. [time-brightcove not-tgx=”true”] But this moment is different from the others, as Biden tries to navigate perhaps the most challenging stretches of his presidency, where doubts about his acuity threaten to overshadow his record.