WASHINGTON - A Republican congressional staffer with 20 years of involvement in hemispheric issues was named Thursday to a new State Department post to hasten democratic transition in communist Cuba. Caleb McCarry, 43, will serve as the Cuba ''transition coordinator,'' a position mandated by President Bush a year ago to implement measures designed to help bring an end to Fidel Castro's 46-year rule and provide assistance to a subsequent democratic Cuba. ''For nearly 50 years, the regime of Fidel Castro has condemned the people of Cuba to a tragic fate of repression and poverty,'' Secretary of State Condoleezza Rice said...