There's another problem which is that you can only donate about $104,000 to a federal candidate's campaign but you are allowed to independently campaign for that politician using unlimited funds. Third party campaigning shouldn't be allowed. It's been ruled a matter of free speech, that if Michael Moore wanted to make a documentary critiquing health care in the US, that is his right. But some people will make documentaries filled with lies. It might be difficult to control what wealthy people do with their money and what they say, but that doesn't mean you can't try.