BNA ($) has the story.  A snippet: “More than a dozen conservative groups that do not disclose their funding sources for election spending joined a brief filed June 27 in a key federal court case testing disclosure requirements for groups that sponsor political advertisements…”

The case is Van Hollen v. FEC, now in the DC Circuit.  The brief is here.  The brief’s primary thrust is clear from one of the argument headings: “There Is No Legitimate Basis to Require Any Reporting and Disclosure for Targeted, Broadcast Issue Ads Which Mention the Name of a Candidate.”  (Of potential interest: one of the attorneys is soon-to-be-Judge Kreep.)