JUST ANOTHER CONVENIENT SCREWUP: Wisconsin union has no idea how that forged card got in there.

Dian Palmer, president of Service Employees International Union Healthcare Wisconsin, wants one thing to be perfectly clear: Her union takes its ethical responsibilities very seriously. So it’s just baffling to her how a forged signature was used to financially support the union’s political arm.

Palmer conceded in a Aug. 11 letter to a lawyer for Milwaukee-based Supportive Homecare Options Inc., that somebody apparently signed up one of the company’s employees to support the union’s Committee on Political Education without that employee’s knowledge or approval. But as far as who that was, well, the trail seems to have gone cold.

Until recently, I had no idea that Wisconsin was such a dirty state. It seemed so clean, until you looked under the covers.