George Clooney uses Hollywood starpower in S.Sudan (AP)

JUBA, Sudan – How do you get a long-suffering but little-known slice of Africa on the White House agenda and onto American TV screens? George Clooney knows how.

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Humble, self-effacing and dressed for safari, the Hollywood star and former Sexiest Man Alive was in the scruffy, straw-hut capital of Southern Sudan on Saturday to draw attention to the region's weeklong independence referendum.

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The vote, which begins Sunday, is likely to create the world's newest nation. Clooney is working to help the region avoid a backslide toward war.

George Clooney uses Hollywood starpower in S.Sudan (AP)