Women react as they gather at Simon Bolivar square in support of Venezuela's President Hugo Chavez in Caracas,Venezuela, Sunday Dec. 9, 2012. Chavez is to return to Cuba Sunday for another surgery in his battle against cancer, which has led him to speak publicly of a successor for the first time. Chavez said Saturday that if there are "circumstances that prevent me from exercising the presidency further" Vice-President Nicolas Maduro should replace him for the remainder of his term.(AP Photo/Fernando Llano)

Associated Press
Women react as they gather at Simon Bolivar square in support of Venezuela's President Hugo Chavez in Caracas,Venezuela, Sunday Dec.  9, 2012.  Chavez is to return to Cuba Sunday for another surgery in his battle against cancer, which has led him to speak publicly of a successor for the first time.  Chavez said Saturday that if there are "circumstances that prevent me from exercising the presidency further"  Vice-President Nicolas Maduro should replace him for the remainder of his term.(AP Photo/Fernando Llano)
Women react as they gather at Simon Bolivar square in support of Venezuela's President Hugo Chavez in Caracas,Venezuela, Sunday Dec. 9, 2012. Chavez is to return to Cuba Sunday for another surgery in his battle against cancer, which has led him to speak publicly of a successor for the first time. Chavez said Saturday that if there are "circumstances that prevent me from exercising the presidency further" Vice-President Nicolas Maduro should replace him for the remainder of his term.(AP Photo/Fernando Llano)
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