Warning of a difficult fight ahead, former President Barack Obama and Michelle Obama on Tuesday called on the nation to embrace Kamala Harris in urgent messages to the Democratic National Convention that were at times both hopeful and foreboding. “America, hope is making a comeback,” the former first lady declared. She then tore into Republican Donald Trump, a sharp shift from the 2016 convention speech in which she told her party, “When they go low, we go high.” MORE: https://www.cbs8.com/article/news/nation-world/dnc-day-2-democrats-look-to-the-future/507-6654d012-bf1c-4807-a61e-8b612472d34a