Disclaimer: There is no such thing as unbiased news. You can call it “less biased news”. There are numerous other biases that can influence news reporting too.
Overt political bias is probably the least concerning aspect of a democracy because it is simple to identify and weigh.
The more concerning biases in news reporting today are those that are more subtle, such as financial incentives and self-censorship of topics. Many topics are simply not covered, and the mainstream media does not question why.