One of Acorn's own turns it in.

An Acorn Whistleblower Testifies in Court - WSJ.com

The Obama campaign denies it "has any ties" to Acorn, but Mr. Obama's ties are extensive. In 1992 he headed a registration effort for Project Vote, an Acorn partner at the time. He did so well that he was made a top trainer for Acorn's Chicago conferences. In 1995, he represented Acorn in a key case upholding the constitutionality of the new Motor Voter Act -- the first law passed by the Clinton administration -- which created the mandated, nationwide postcard voter registration system that Acorn workers are using to flood election offices with bogus registrations.

Ms. MonCrief testified that in November 2007 Project Vote development director Karyn Gillette told her she had direct contact with the Obama campaign and had obtained their donor lists. Ms. MonCrief also testified she was given a spreadsheet to use in cultivating Obama donors who had maxed out on donations to the candidate, but who could contribute to voter registration efforts. Project Vote calls the allegation "absolutely false."

Article