If this is a question of principle you've surely already lost; there are plenty of non-controversial areas in which organizations are afforded greater or lesser rights than individuals based on their functional role in society: non-profits and charities are expressly forbidden from political campaigning, while the New York Times can legally publish Wikileaks in a way that Julian Assange apparently cannot.

I'm sure a sensible law can find a way to reduce soft-money flows without wiping out forums and newspapers. Nor is anyone saying that organizations cannot express political viewpoints. The question is about the corrupting influence of soft-money flows and if the situation is too complex to allow for that, it is surely too complex for limited liability corporations to exist in the first place.