Do journalism and politics mix?

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The first thing I want to say here is that I do not consider John Stewart, Rush Limbaugh, Anne Coulter, Michael Moore or any others of their ilk journalists. Their value is in their opinions and in their slant, not in their ability to present facts. Right, on with the question. Do journalists have the duty or the right to question authority? Is the journalist's job to present the facts, whatever that means, and just the facts, and to remain as non partisan as possible or is their job to provoke and question what they see and present the idea as fully as they can? My issue with "non partisan" news, history, or facts is that I do not believe they exist. I do not believe that any one fact can exist without being colored by perception. Maybe elemetry maths is exepmpt from this statement, but even then, the possibility of other conceptions of math, non binary math, for instance preclude its absolute truth. What do you think? Not about math, but about Journalism.