Silence on ACORN Prostitution story

As one news commenter put it, this ACORN/Prostitution/Tax Fraud/Underage Sex Slavery story has everything the media normally drools over. It has sex, taxpayer money by the billions, illegal sex-trade slavery trafficking into the US, corruption, law-breaking, undercover caught-on-tape style video, scandal, prostitution, fraud, etc, etc. Normally, a story that includes all of that gets wall-to-wall media coverage, sometimes stretching for months. Yet virtually the only media outlet doing the story justice, covering it to the extent that a story like this deserves coverage, is Fox. Why is the rest of the media landscape silent on this mega-story?