The Republican Governors Public Policy Committee is a nonprofit organization with a multimillion dollar budget devoted to "promoting social welfare and efficient and responsible government practices" according to the most recent tax return it filed with the Internal Revenue Service. On its website, the group tells a different story: It's "the official policy organization of the nation’s Republican governors."

As House Government Oversight and Reform Committee Chair Darrell Issa, R-Calif., prepares to broaden his investigation of the Internal Revenue Service's admitted targeting of conservative groups ...