Do Media Oligarchs Silence Dissent and Censor Content?

The narrowly decided 2010 decision in Citizens United v. F.E.C. unleashed unlimited spending in our elections both local and federal. This enables our democratic process to be manipulated. How does this affect our media? The powerful support candidates who promise to deregulate; hence we now have 6 corporations that control what we see, read, and hear. Democracy needs sunlight.