They're all members of the G&M editorial board that collectively makes the decision as to which, if any, political party of candidate to endorse.  Ultimately, all of them, including those you refer to as "news editors" answer to the publisher (and he or she to the owners - the Thomson family).  If the "news editors" insisted on publishing news articles that were at philosophical and political odds with those of the publisher, they would find themselves working for Headline News.