(120720) -- WASHINGTON D.C., July 20, 2012 (Xinhua) -- U.S. President Barack Obama walks after his arrival at the South Lawn of the White House in Washington D.C., capital of the United States, July 20, 2012. Obama on Friday cut short his two-day campaign swing and returned to the White House after a deadly shooting in Aurora, Colorado, saying there can be others days for politics. (Xinhua/Zhang Jun)
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