THE nation's oldest Hispanic-American civil rights organization has a message for the Cartoon Network: "I want my mouse back. Not Mickey, but Speedy." The League of United Latin American Citizens (LULAC) is calling on the cable channel to show Speedy Gonzales cartoons because "Speedy's a cultural icon. He's a good mouse," according to Gabriela Lemus, director of policy and legislation for LULAC. The Mexican mouse of Warner Brothers cartoon fame was taken off the air by the Cartoon Network because of what network officials described as excessive smoking and drinking by the cartoon's characters and low viewership. But concerns over...