CARACAS, Venezuela (Reuters) - Cuban president Fidel Castro said (on) Sunday his friend and ally, president Hugo Chavez of Venezuela, could speak for him and his revolutionary ideas at a world development conference in Mexico this week. "Even if I don't go, we, I, feel represented in your words," Castro told Chavez in a telephone call during a marathon live broadcast of the Venezuelan leader's weekly "Hello President" television and radio program. The 75-year-old Cuban leader, who swapped banter, baseball talk and mutual praise with his younger counterpart during the on-air chat, said he had not yet made up his...