The modern day mainstream media is often referred to as an echo chamber. Once the narrative of a particular story has been set, all subsequent stories tend to fall in line. At four minutes, this video might seem long, but at times it seems it takes no longer for the media to fall in step with the beat of the same drummer... so to speak (via Twenty-Two Words):
Admittedly, the conservative media has the same tendency. Hey, but when you're right, everyone should march to the same beat!