"The lawsuit does not seek specific monetary damages, but wants Google to prohibit 'advertising relating to Web sites that display, market or otherwise provide illegal access to pornography.'"
Hmmm... no mention of CHILD pornography in that. That statement reeks of election year grandstanding.
As mentioned anywhere that does have child (or I can imagine a few other categories) porn they do not allow advertising, block it from the search engine, and notify the authorities.
If you were really worried about child porn you would also go after Microsoft (MSN search) and Yahoo. Both have ads in their search engine, or are adding them soon. Besides there a tons of sites & even books on how to boost your search ranking that bypass all advertising.
As an aside, I do not recall seeing any porn ads in my search results from Google. Adsense is pretty good at matching advertisors to your search terms.
If someone really wants to stop the spread of porn, maybe you should go after the spammers who send me a ton of 'naked h0rny t33n' emails. Who needs to search when it comes to my inbox daily?