Though The New York Times is undeniably liberal in its reporting, it has been distinctly cool in coverage of the most left-wing Democratic candidate, Senator Bernie Sanders (I-VT). It was obvious back in 2016, when reporters tried to pester Sanders out of the race against Hillary Clinton. Is it principled ideology on the part of reporters, or partisan fear? Either way, the paper fired a shot across Bernie’s bow Sunday with a story bluntly warning Sanders he better watch out, then laid out why, even using an old insult to Ronald Reagan: “Sanders, the Teflon Candidate, Faces New...