One Friday last month, Jamie Raskin, a Democratic congressman from Maryland, spent a chunk of his day in court securing a protective order. It was not his first. Mr. Raskin, who played a leading role in Donald J. Trump’s second impeachment hearing, said he received about 50 menacing calls, emails and letters every month that are turned over to the Capitol Police. His latest court visit was prompted by a man who showed up at his house and screamed in his face about the Covid-19 vaccine, Mr.... Read this story