Amen. The question is, is the editor the editor of a newspaper or a newspaper*.
BTW, was this an in-house editorial or a guest editorial? It makes a difference because the former represents the official view of the paper and the latter doesn't. If it was the former, then the Journal-Sentinel is a newspaper*. If it is the latter, then the paper is a newspaper with questionable judgment but still a newspaper in the classic sense.
don't we call guest editorials 'columns'?