Was Walmart behind a mysterious 2011 investigation into LAANE?

Last spring and summer, the Los Angeles Alliance for a New Economy (LAANE) was the subject of a massive investigation by MB Public Affairs, a right-wing opposition research firm led by Karl Rove operative Mark Bogetich. The firm requested thousands of documents from over 70 elected officials and public agencies in the LA region, costing an estimated $50,000. But the client behind the inquiries and the reason for their interest in LAANE remained a mystery.