President Barack Obama formally endorsed Hillary Clinton in a video released Thursday afternoon. "I know how hard this job can be. That's why I know Hillary will be so good at it. In fact, I don't think there's ever been someone so qualified to hold this office," he says in the video, which was tweeted by Clinton's official Twitter account. "I have seen her judgment, I have seen her toughness, I have seen her commitment to our values up close," he said of his fo