Sun Nov 15, 11:05 PM ET

U.S. President Barack Obama (2nd L) walks with Mayor of Shanghai Han Zheng (3rd L) at the Xijiao State Guest House in Shanghai November 16, 2009. Obama faces tensions with China over trade and Tibet on his first visit to the emerging superpower for a summit that will grapple with economic imbalances and the future of the yuan currency. REUTERS/Jim Young (CHINA POLITICS)

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