Journalists seek to report objectively, in my mind. If they don't have journalistic objectivity, then they can't be called journalists.
en.wikipedia.org
Maddow does not have journalistic objectivity. She's never studied journalism, and never worked as a reporter, instead always working in the media as an on air personality opining from the left. This is the equivalent of a op-ed columnist on air with an extreme partisan bent. She is clearly biased and is not out collecting facts or broadcasting neutral pieces on air. Put another way, she is the left's version of Hannity or O'Reilly, although smarter and better able to support her arguments. But make no mistake, she's making arguments based on opinions and her particular left-leaning values.
That Fox and MSNBC have so degraded what otherwise intelligent people think of as a journalist is further evidence of the degradation of our political discourse and ability to think objectively about partisan topics.