Yes, yes and yes: the US media IS biased toward liberalism. Now, what does that mean and why? First of all, lets look at the two major US political parties: one (the Republican Party) is clearly more anti-science than the other. Reality is clearly best evaluated by science. Reality DOES have a liberal bias. Case made. Any challengers?
To better understand what the Republicans/conservatives/Trumpsters are doing regarding their cries of "media bias", these links present some recent results from the logical fallacy called "False Equivalency:"
How False Equivalence Is Distorting the 2016 Election Coverage
Today's Hero of the False-Equivalence Struggles: On the Media
Top Beltway reporters promulgate absurd false equivalence on Clinton, Trump
The False Equivalence of Clinton and Trump’s Negatives
SCIENCE (from the Latin for 'knowledge') informs wisdom, reason and humanism. This is a 4-legged worldview within reality that maximizes well-being for individuals and society.