Actually your example of newspaper and TV stations exactly examplifies why billionaires have such a vast political power which is unhealthy for society. No single TV station, newspaper by itself would ever yield so much power as to be able to shape public opinion in one direction. However take the media empire of the Murdochs which yields a disproportionate amount of power in several countries, very directly pushing the ideology of it's owners.

I'd say the New York Times is far more influential than murdoch's tabloids and fox. But that's just my opinion.

What do all of them have in common?