MADISON, Wisconsin — This is what an abusive, politically motivated investigation looks like: The sun had yet to rise when deputies pounded on the door of Deborah Jordahl’s home in a quiet suburb of Madison. They had a warrant, and they were coming in. Armed law enforcement officers, led by Milwaukee County District Attorney investigator Anna Linden, proceeded to root through the home. They hauled out computers, smartphones, paper records and an array of “evidence” that had nothing to do with the investigation, private possessions that weren’t listed on the sweeping warrants. Through it all, Jordahl, her husband, and her...