One of my favorite sites for center-left opinion is CommonDreams.org
While they do have some original content, a lot
of their headline opinion pieces are copied in full from the original source and wrapped in the site's design template. If not for the small print identifying the original source, the article would look like copy produced and owned by CommonDreams.org. I wonder how they have gotten by so long without being served these notices... Or are they getting permission? (seems unlikely, as the opinion pieces are taken the same day they appear in print).