In Citizens United, the Supreme Court ruled that independent organizations could not have their free speech stifled by campaign laws. So people could donate as much as they wanted to independent Super-PACs, which could spend as much as they wanted, without oversight, regulation, or even disclosure. As long as the PAC was independent.
This tissue-thin fantasy didn't even last until the next Presidential election. We're still in the primary stage, and already Newt Gingrich is asking his Super-PAC to pull an ad running against Mitt Romney (because it's too effective).
But if the PAC does stop the ad, based on Newt's request... how is that not "coordinating?" What does the word even mean, if it doesn't mean that?