File photo taken on Jan. 29, 2014 shows U.S. President Barack Obama shaking hands with audience after delivering a speech on raising the federal minimum wage at a local Costco store in Lanham, Maryland, the United States. Obama's approval rating sinked to a new low of 41% in March from 43% in January, according to a WSJ/NBC poll. (Xinhua/Yin Bogu) |
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