Ake, there's more to it than merely identifying the source of a politically slanted article. To dismiss the article solely on the basis of the biases of the source is to fall into the fallacy of argumentum ad homonym. Even the most biased of sources can speak the truth now and then.

One goes on to check the facts upon which the slant of the article is based.

Which, having worked as a broadcast news director and news editor, I am accustomed to doing.

Don Firth