Though it might not always seem like it, the news media is composed of human beings. Humans aren't, can't be, and possibly shouldn't be, objective. Still, there's a reasonable expectation among consumers of political news that journalists of all political stripes strive to be as objective as possible. At their minimum, media outlets ought to be straightforward about their biases. They certainly shouldn't have, or appear to have, their thumbs on the scales.
Unfortunately, all too often, it appears that the political system is rigged — and that the major media companies play an important role in gaming the system. That's what has happened throughout this year's Democratic primaries, in which the vast majority of corporate media outlets appear to have been in the bag for Hillary Clinton, the establishment candidate, against self-described "democratic socialist" insurgent Bernie Sanders.
Examinations of coverage have confirmed the impressions of cable news junkies that Sanders has been the victim of a blackout, thus depriving him of a chance to make his case to voters. When the chairwoman of the Democratic Party, Debbie Wasserman Schultz, scheduled the first round of Democratic debates at times the party hoped nobody would be watching — again, a seemingly obvious ploy to deprive Sanders of exposure — corporate media outlets had little to say about it.