Pack journalism
Pack journalism is the characterization of news reporting as having become homogeneous. The term was coined by Timothy Crouse.
Pack journalism occurs because the reporters often rely on one another for news tips or are all similarly dependent on a single source for access (which is often the very person they are covering). A type of groupthink occurs, as the journalists are constantly aware of what the others are reporting and an informal consensus emerges on what is newsworthy.