First some history…
While our mainstream media has always been corrupt, things changed dramatically for the worse after President George W. Bush won re-election in 2004. You see, that wasn't supposed to happen. The reason it did, though, was because the media lost of control of the Narrative. Simply put, other than John Kerry being a hugely unlikable individual, the Swiftboat Veterans for Truth (SBVT) effectively undermined the strength that was supposed to knock "that idiot" off his throne.
If you recall, the SBVT were a group of veterans, many of whom had served with Kerry in Vietnam, who got together, formed a 527 organization and launched a series of devastating ads criticizing Kerry for the heinous lies he told about Vietnam Veterans. On top of that, they questioned his heroic war record.