Well, for example, you could take a look at some of each politicians' most influential policies and compare them to the media's position on these issues. Virtually no US media espouses a position for universal/single payer healthcare (one of Sanders' most important policy proposals), yet all mainstream US media outlets endorsed Trump's recent strike on Syria (one of Trump's most influential decisions so far). In fact, out of the top 100 newspapers in the US, only the Houston Chronicle published a condemnation of Trump's bombing. Liberals and conservative media personalities came together to praise Trump when he spoke about his botched Yemen raid, and they also were united in their condemnation of Sanders running a campaign to the left of Clinton to the point of absurdity. This is because Trump falls in line with the prevailing ideology of America's ruling class in terms of foreign policy and economics while Sanders represents a threat to the status quo. The kind of threat that apparently [warrants publishing 16 condemnations of his campaign] in 1 day, from a variety of angles, most of which were either somehow overtly racist or appeals to right wing economics.

There are many other examples I could give but these are just the first that come to mind.