U.N. official says Sudan is still worth fighting for

• Story Highlights
• Special investigator for Sudan wants her assignment extended another year
  
• She says "political alliances" causing countries to ignore abuses in the nation
  
• Vote at 47-nation rights Human Rights Council next week is expected to be close
  
• In Darfur, up to 300,000 people killed, 2.5 million chased from homes since 2003
  
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