A legal filing made Tuesday by horsemen who lost a decision last month in a federal appeals court means there are now three separate cases involving the constitutionality of the Horseracing Integrity and Safety Act (HISA) vying for the attention of the Supreme Court of the United States. A group of plaintiffs led by Bill Walmsley, the president of the Arkansas Horsemen's Benevolent and Protective Association (HBPA), and Jon Moss, the executive director of the Iowa HBPA, on Oct. 15 filed a writ of certiorari asking the Supreme Court to...