WASHINGTON, DC - MARCH 21: With the U.S. Capitol building in the distance, some 200,000 immigrants' rights activists flood the National Mall  on March 21, 2010 in Washington DC.
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WASHINGTON, DC - MARCH 21: With the U.S. Capitol building in the distance, some 200,000 immigrants' rights activists flood the National Mall on March 21, 2010 in Washington DC.