Are the Koch Brothers an example of free speech gone horridly, horribly wrong?

This has to do, in part, with the Citizens United decision by the Supreme Court. There is a new documentary out about the Koch Brothers about their efforts to, well, control the world.

While no one has exclusive rights (or lack thereof) to the marketplace of ideas, would America be improved by greatly limiting political discourse purchased by money from a single source?

I believe we should all have equal access to government. I am for repeal of the Citizens United ruling. I am against giving money to politicians: I want elections to be funded by the government only.

However, I am not sure where I stand on the how else to limit the ‘voice’ of the Koch Brothers or whether we should. I welcome positive commentary from the Fluther community to help me suss this out.

Should we make it illegal to ‘buy’ Free Speech?