The Liberal Media

So taking into account the recent events in Iran, do Americans still see a strong bias in the media to be "liberal"?

In this case what is a liberal media? It is one that reports with due diligence in its stories? Is it one that brings the unfiltered truth no matter how gruesome?

Or is it a media that does not question a Democratic President's opinion on the American situation during an international time of crisis?

Or is it one that goes against that Democrat, to be truly liberal, and air the grievances of the opposition party?

Perhaps a liberal media is one that is truly out to undermine the powers of the federal government? (Or keep hammering home one ideological slant over another for their readers/viewing base?)

Or maybe just maybe, a real liberal media is one that just calls it down the middle, and sees that truth in reporting huge moral, political, and economic issues, isn't about who you know is reading your news....but how you want your news to be read.