CBS and Super Bowl Ads

Does anybody remember the controversy surrounding CBS's refusal to run an ad that was critical of the Bush administration during the 2004 Super Bowl? You can read Peter Henderson's article here. It seems that the threshold is pretty low when it comes to refusing an ad and pretty high for being prosecuted for defamation. That should make it easy for news providers to do the right thing. Given this set of circumstances, it is quite surprising that the Crimson would display such a lack of judgement with regard to the Holocaust denial issue by running that ad.