Obama can't do much on guns, but he has mainstreamed a dangerous idea about governing.Over the winter break I finally got around to binge-watching “Parks and Recreation.†In case you missed the show's seven-year run, it's about a fascistic, small-town councilwoman who believes it's a politician's job to impose her notions of morality, safety, and decency on everyone, no matter what voters want or what the system dictates. She is justifiably recalled by the people of her town after attempting to regulate portion sizes at fast food restaurants, but ends up running a federal office where she can do big...