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mediacracy

n. rule by the media; a situation in which the media dominates or controls the populace.

Wikipedia
Mediacracy

Mediacracy is a situation in government where the mass media effectively has control over the voting public. Mediacracy is closely related to a theory on the role of media in the United States Political System, that argues that media and news outlets have a large level of influence over voting citizens' evaluations of candidates and political issues, thereby possessing effective control over politics in the United States.