The most significant element of the coverage that has so rankled the Clinton campaign may be one that cannot responsibly be omitted: her recent win-loss record in nominating contests.

“My role model and mentor at The A.P. was Walter Mears, who recently retired, and he used to say that who wins is part of the story,” said Mike Glover, an Associated Press reporter, as he flew on Mrs. Clinton’s plane on Thursday from Hanging Rock, Ohio, to Houston. “We’re covering a candidate who’s lost 11 straight primaries. They’re covering a candidate who has won 11 straight primaries.”