The situation is more than obvious: ( Concentration of media ownership) and has been for a long long time. Bernie Sanders is saying things that are resonating among growing numbers of people. The things Bernie is saying are revolutionary in their very nature. He is pointing out the nature of a totally corrupt system that uses the media and the electoral process to deflect people's attention from the system they need to change.
In the midst of the swelling numbers of people who are being enabled to say openly that they want the system changed there are plenty of tactics being used to try to marginalize Bernie.