WASHINGTON - Since the Breeders' Cup Pick Six scandal erupted, horseplayers have been keenly aware of suspiciously low payoffs and late changes in odds, fearing that more cheaters have found a way to corrupt the parimutuel system. Most such concerns are based on sheer paranoia. But any knowledgeable fan who saw the results of the pick four on opening day at Gulfstream Park would readily conclude that something was rotten in the state of Florida.