A billboard calling incumbent school board candidate Nikki Hudson a failure towers over High Street as drivers enter Worthington from Clintonville. It's unclear who is behind the billboards, which appeared on Oct. 4. They're just one example of attacks veiled behind a cloak of anonymity in what has become a hotly debated Worthington school board election. It’s been fueled in part by a mysterious nonprofit (501c4) group and a limited liability corporation. Disinformation, dark money and negative ads are becoming increasingly common in local school board races.