>Why can't Koch brothers buy advertisements trashing Hillary Clinton when Jeff Bezos can buy the Washington Post and then run a hit piece on Marco Rubio?
This. I've heard people joking refer to campaign finance laws as "enforcement of mainstream media relevance".
Campaigning is done on corporate television. The print press is for profit corporations.
Can you imagine a free election without the New York Times, Washington Post, CNN, Twitter, Reddit, etc.
Why can't Koch brothers buy advertisements trashing Hillary Clinton when Jeff Bezos can buy the Washington Post and then run a hit piece on Marco Rubio?
Getting private corporations out of the speech business is probably impossible because of the internet. You could probably devise a system to attempt it, but it would be radical.