The cover of a wallet bearing an image of U.S. President Barack Obama's face, in place of the usual image of China's late Chairman Mao Zedong, is pictured at a souvenir shop in Beijing, January 18, 2011. U.S. senators pressed Congress to get tough with China over "manipulating" its currency in a riposte to Chinese President Hu Jintao, who said this week he would not accept U.S. arguments the yuan was undervalued. REUTERS/Jason Lee(CHINA - Tags: POLITICS BUSINESS)