The Better Cotton Initiative faced scrutiny over its work after partnering with Chinese firm accused of rights abuses.
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There are almost nine million Indonesians living abroad, a key constituency for the contenders Widodo and Subianto.
Indonesia may be Southeast Asia’s most successful democracy, but communist and regional parties are still banned.
Indonesia’s Muslim parties fared better than expected in April’s parliamentary vote but are unlikely to win power.
Indonesia polls are a contest between two diametrically opposed views of the country’s troubled past.