CEDAR RAPIDS — Eugene Kopecky, a retired Cedar Rapids attorney and one-time Linn County attorney, is taking on the Iowa Racing and Gaming Commission in an effort to win a state gaming license for a Cedar Rapids casino.Kopecky filed a lawsuit this week in Linn County District Court against the commission and the four of five commission members who voted April 17 to deny a state gaming license to casino investor group Cedar Rapids Development Group LLC.Kopecky, who has practiced law in Cedar Rapids since 1966, said Thursday that his lawsuit seeks a declaratory judgment.