The problem as I see it is that representatives are forced (due to the exorbitant cost of campaigning) to win over wealthy interests. This manifests itself as what we've seen with the whole SOPA debacle: representatives who are completely out of touch with their constituents.
My point is that the site itself, and many people here, present a caricature of the problem. If you talk too much abou the caricature, someone may say "Oh, yes, I see, so let's do a better job of investigating and prosecuting people who buy and sell votes." The real problem is more sublte, and it is inherent in how the system works.
Even if you adopted additional restrictions on corporate financing I'm pretty sure there would be all kinds of ways to shadow-fund a candidate. This creates a situation where honest candidates are unfairly penalized against candidates that still play the money game.
Also, I was not arguing whether or not any of these proposals can be 100% effective (like you clearly deny). This is a straw man, but it is definitely worth debate on a case-by-case basis.
 most recent (and probably most ambitious) example: https://www.popvox.com/bills/us/112/hjres100/report. An intriguing proposal from L. Lessig: http://www.plainsite.org/issues/index.html?id=29