Hmm. While a court has discretion whether to permit an amicus curiae brief, I didn't think they were often rejected b/c they were from a partisan organization. In fact, I thought their whole point was to argue for or against a particular issue and help the court arrive at what the author of the brief thinks is the right legal answer. Perhaps here the court felt that these briefs were not adding anything helpful that wasn't already presented by the parties in the case.