@General Battuta :
You are mostly speaking about getting money out of the election process. What about other parts of the political decision process ?
I don't know much about American politics, but, the EU for example relies a lot on semi independent advisers (coming from the corporate world, national administrations, and some NGOs) to prepare its directives and regulations.
In 2001, the EU Commission (a board responsible for proposing new directives and regulations and applying them, after they are approved by both the Council of the EU and the European Parliament) published a White Paper, a set of guidelines, regarding how to participate in the decision process.
This White Paper is designed for use by what they call "Civil Society", but it turns out the only way to "participate" efficiently, according to this WP, is to publish high grade studies about highly technical topics. The only groups of people who can afford (time, money, HRs) to do this work are big corporations, and a few NGOs...
I can't say it's really good for the public interest. Everybody in the EU "work groups" think what they are doing is something technical (free market regulations, food or water safety...), but in the end it's still politics... If they want to be on par with companies, trade unions and NGOs have to pay their social scientists and lawyers on the same level as corporate lawyers, so they pick their battles. The EU tries to encourage transparency by registering private interest representatives, publishing their sources of income, but it's not enough yet.
Once you know that big chunks (if not all) of economic sovereignty (including free market, taxes, commercial law, money) of 28 countries making together the first GDP in this world have been transferred to the EU and its post-democratic shared beliefs, it gets somehow scary.
I don't know how it's evolving in Washington, but it has to be somehow similar. So, to me, big money in the election process is only one issue among many others in our political systems...