If negative attack ads were curtailed, Zero would be forced to acutally campaign on the issues Zer0 isn't even letting the Constitution "force" him to act properly.
Look at his reckless disregard for Congress' rejection of amnesty.
Look what he did last week in cancelling Welfare Reform, a 16 year old federal law.
What makes you think he'd obey some new law that tells him not to say bad things ?
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But it wouldn't be a law. I'm talking about a private agreement among all broadcast media to boycott these ads. If the boycott were upheld properly, Zero (or the guy running for county dogcatcher) could send negative attack ads to the broadcasters until they were blue in the face--they just wouldn't be aired!