 President Biden's campaign manager says when Biden comes out of isolation due to COVID, he could hit the campaign trail next week. That, as CBS's Ed O'Keefe reports. Three more senators have joined the growing chorus calling on Biden to drop out. New Mexico Senator Martin Heinrich says it's in the best interest of our country for the president to go. And Montana's Jon Tester says if the president steps aside, the party should have an open contest for the nomination, not just hand it to Vice President Harris.