When CNN hired Sarah Isgur, a former Jeff Sessions spokeswoman and now staff writer at The Dispatch, last year to be a political editor at its Washington bureau, left-wing media types put on a full-court press to smear her professionalism. The CNN newsroom — which, last I looked, included former Obama official Jim Sciutto — was reportedly “demoralized” by her very presence. Conservatives, and it’s probably fair to say that Isgur is a pretty moderate one, aren’t welcome in mainstream journalism. We don’t need to go through all the numbers and polls to stress this point. Journalists have long jumped...