Michael Scherer on the heated Nevada Democratic debate. And John Woodrow Cox andHannah Natanson talk about how President Trump’s rhetoric has affected bullying in American schools. Read more: Mike Bloomberg made his prime-time debut at the Democratic debate in Las Vegas — and he didn’t get a warm welcome from the other candidates. The president’s rhetoric has changed the way hundreds of children are harassed in American classrooms.Subscribe to The Washington Post: postreports.com/offer