Doug Elmets, a former speechwriter for President Ronald Reagan, admitted when he took the stage at the Democratic National Convention on Thursday that it was not an event he'd ever thought he'd attend. "Unlike many of you, I'm a Republican," he said. "Forty years ago, I cast my first vote for president, voting Republican that day like I would do time and again." He still reveres his former boss, and had a stinging message for Donald Trump.