In late March, White House press secretary Josh Earnest disclosed to reporters that he had been in touch with aides to presidential candidate Hillary Clinton. Earnest described the communications as taking place “in the context of my best efforts to try to answer your questions” about the controversy over her use of a private email server while at the State Department. White House officials say those kinds of consultations between communications staff on either side have continued, in the words of one aide, “so that we don’t talk at cross-purposes on emails, or Benghazi, things like that.” On the whole,...