Read ADVISE AND CONSENT, a novel originally published in 1959. It portrays how the media work together because they all "think alike." Formal consultation isn't necessary.
The novel itself deals with the nomination and Senate consideration of a controversial nominee for Secretary of State, hence the title.
Most beginning journalists get their jobs through who they or their families know. They are obligated to prove their loyalty, follow tradition, and not make waves. They aspire to parties in the Hamptons, the press pool on AF1, being called on at pressers, and getting perks from their liberal bosses.