>>News Corp owns Fox News, which is stridently right-wing, but also the Fox network, which broadcasts more left-leaning shows like The Simpsons, Family Guy, and American Dad. In fact, Fox's prime time cartoons regularly mock Fox News.

Except for the fact that Fox News is (unfortunately) taken seriously by millions of Americans and therefore has much more power over political discourse, whereas shows like Simpsons and Family guy are satire.

>>Koch isn't a media company.

It literally doesn't matter. If you think a corporation has to have media outlets in order to affect cultural and political discourse, you are either living under a rock or just hopelessly naive.