U.S. President Joe Biden returned to work at the White House on Tuesday. His doctor says he is testing negative for COVID-19. He plans to address the nation on Wednesday night about his decision to drop his reelection bid. Vice President Kamala Harris makes her first stump speech as a candidate for the presidency. We talk to Clifford Young from Ipsos about the latest polling data and other indicators. And Mattel has added its first-ever blind Barbie doll to its diverse collection.