Of course there is bias in the media.
Here is an experiment for all to try. Whenever there is a news story, that on the surface would be considered either a positive or negative for either party, watch all of the news outlets and observe how they report the stories; how much time they spend on the story, who they have on as guests to discuss the stories, which facts of the story they emphasize and which facts they minimize.
It is really interesting, if you have the discipline to do it.