UNITED NATIONS (Reuters) - Secretary-General Ban Ki-moon named actor George Clooney, who has campaigned for refugees in Darfur, as a U.N. "messenger of peace" on Friday to promote the world body's peacekeeping efforts. Clooney is the ninth U.N. messenger -- people chosen from the fields of art, music, literature and sports who have agreed to help focus attention on the United Nations' work. U.N. spokeswoman Michele Montas said Clooney would have a special emphasis on peacekeeping. She said he had been "recognized for focusing public attention on crucial international political and social issues." Clooney, who is currently in Sudan, will...