Gaming revenues in the 12 states with commercial casinos have tumbled 2.5 % through the first nine months of 2008 and the trend worsened as the year progressed. That was the bleak outlook painted by AGA CEO Frank Fahrenkopf Jr. as the Global Gaming Expo is taking place at the Las Vegas Convention Center. Fahrenkopf said most of the show’s break-out sessions will address the global and national economic crisis and how it is impacting casino operators and gambling equipment manufacturers.