All media outlets are, only the degree of audacity varies.
CNN is especially eggregious. NYTimes should also be on the left column which is reflected in the votes "Somewhat disagree" with the current characterization as Center-Left (scroll down).
Edit: I am just pointing out a free publicly available dataset of what the population thinks of the media. Make what you will, don't shoot me.
Politics is preference, talks of truth are usually a pretense to strengthen a reason for a given preference.
There is presumably one true model that matches reality best. You could call that "unbiased", but since nobody can reliably identify it, we're stuck with bias.