File photo taken on Feb. 12, 2014 shows U.S. President Barack Obama blinking during signing an executive order to raise the minimum wage for federal contract workers in the East Room of the White House in Washington D.C., 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) |