The Fourth Estate enjoys no special immunity from the law of diminishing returns.
The louder Don Lemon, Anderson Cooper, and Andrea Mitchell scold voters for daydreaming of committing heresies against democracy in the voting booth on November 8, the firmer viewers press that internal mute button in their minds. A liberal-bias Laffer Curve demonstrates that the more journalists allow their preferences to override objectivity, the more viewers filter out spin from information and tune out advocacy. CNNMSNBCNewYorkTimesPoliticoetc persuades the public that they harbor deep biases. They don’t necessarily persuade readers and viewers to adopt those biases.
Ratings and revenue tells us as much. So, too, does polling.