You can find Politico’s coverage in “Super PACs go stealth through first contests” by Dave Levinthal and Kenneth P. Vogel.

According to the article, some in the Federal Election Commission are calling for a change of the rules to allow for greater disclosure:

The disclosure rules may need to be updated to reflect the rise of super PACs as driving forces in presidential politics, two Democratic FEC commissioners suggested in interviews with POLITICO. “Super PACs are functioning as the alter egos of the campaigns, and their activity was clearly not anticipated when the statutes were put in place,” said Ellen Weintraub, a Democratic FEC appointee. The commission, she said, “should reconsider the regulations about caucuses and disclosure or at least take a hard look at them.”