Under the threat of legal action from the state, the Nebraska Racing Commission delayed a decision on whether to permit slot-like machines that allow patrons to gamble on historical horse races. Last October, the five-member group, which regulates horse racing in Nebraska, agreed to allow the machines at Fonner Park in Grand Island. The commission rescinded that vote Wednesday after Attorney General Doug Peterson said the October meeting violated open meeting rules. He also said the commission lacked the legal authority to add the machines because they constitute a new form of gambling.