South African ruling party supporters sing during a protest in Johannesburg, South Africa on Tuesday May 29, 2012. The African National Congress and its alliance partners marched to the Goodman Gallery to protest against a now-defaced painting depicting President Jacob Zuma. (AP Photo/Themba Hadebe)

Associated Press
South African ruling party supporters sing during a protest in Johannesburg, South Africa on Tuesday May 29, 2012. The African National Congress and its alliance partners marched to the Goodman Gallery to protest against a now-defaced painting depicting President Jacob Zuma. (AP Photo/Themba Hadebe)
South African ruling party supporters sing during a protest in Johannesburg, South Africa on Tuesday May 29, 2012. The African National Congress and its alliance partners marched to the Goodman Gallery to protest against a now-defaced painting depicting President Jacob Zuma. (AP Photo/Themba Hadebe)
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