NBC News got Biden all morning long Monday as he officially launched his so-called American Promise Tour promoting his new memoir Promise Me, Dad, about the last year of his son Beau’s life. But across most of the morning franchise’s four hours, he took questions about 2020, President Trump, and Hillary Clinton. “I understand the Rust Belt,” Biden told Kelly. “Donald Trump has no notion what those people are going through…It’s not a criticism; it’s an observation. They call me Middle Class Joe – it’s not meant as a compliment in Washington, it means I’m not sophisticated. But I understand...