> Politico did a pretty big study on it a couple months back showing that virtually all large outlets are clustered around liberal metropolitan areas. Politico, of all places.

May I suggest that it's not causation?

Other large outlet headquarters:

Fox News: New York City

Breitbart: Los Angeles

Infowars: Austin

A slight change in your text:

> virtually all large [any type of corporation] are clustered around liberal metropolitan areas