evidence: Former President Barack Obama endorsed his vice president, Joe Biden, as Democratic nominee, joining former candidates Sen. Bernie Sanders and Sen. Elizabeth Warren in trying to unite the party. But while Biden is self-isolating at his home in Delaware, President Trump has been dominating headlines and holding regular on-camera briefings. [...] FORMER PRESIDENT BARACK OBAMA: (From video.) I’m so proud to endorse Joe Biden for president of the United States. One thing everybody has learned by now is that the Republicans occupying the White House and running the U.S. Senate are not interested in progress; they’re interested in power. We have to look to the future. Bernie understands that and Joe understands that. It’s one of the reasons that Joe already has what is the most progressive platform of any major-party nominee in history, because even before the pandemic turned the world upside down it was already clear that we needed real structural change.