The Associated Press will no longer employ Melanie Plenda, a leftist activist exposed by Breitbart News, after she was caught violating the news wire service’s editorial standards. Plenda announced that the AP has terminated her effective immediately in an interview with the Washington Post’s Erik Wemple. Her termination comes as a Nov. 10, 2016, Facebook post she wrote—in which she pledged resistance to then-incoming President Donald J. Trump—was found to be in direct violation of the AP’s editorial standards. Plenda, in her interview with Wemple, confirmed she wrote the leftist activist post on her Facebook page—a post she has since...