Robert Smith captivated America in May 2019 when he pledged to pay off student debt for Morehouse College's graduating class. It was Smith's introduction on the national stage, but he’d had decades of success in private equity that made him the wealthiest Black person in the U.S. and a philanthropic force. Now, Bloomberg News reports that he's under criminal investigation by the IRS, which could dent both his reputation and his political ambitions. Dan digs in with Bloomberg reporter Neil Weinberg.