I would call into the question the notion that an "unbiased" news source is even possible. What is that? Even in a hypothetical, entirely objective coverage an event, the news publication must decide whether to give such coverage time and space as compared to other stories. That time/space is balanced against corporate advertising and the corporate interests that own the publication (or the government grants, or the subscribers, or whatever the funding is). Choosing to cover or not cover something is bias, before the news article even exists.