Washington, D.C.—National campaign finance watchdog Public Campaign Action Fund sent a letter to the Dane County (WI) District Attorney and Wisconsin’s Government Accountability Board (GAB) today urging that they open concurrent investigations into Gov. Scott Walker’s (R-Wisc.) possible double violations of state campaign finance and ethics statutes. The letter is in response to yesterday’s release of a taped phone call between Gov. Walker and a person he thought was out-of-state, billionaire campaign donor David Koch.