Crowds gather on the National Mall to commemorate the 50th Anniversary of the March on WashingtonWith the aid of Ian Simpson and Jeff Mason WASHINGTON (Reuters) – The united states is struggling to fully understand the vision that civil rights chief Martin Luther King described in his famous "I’ve a dream" speech 50 years ago, as the purpose of economic security for all continues to be elusive, President Barack Obama stated on Wednesday. Obama, the first black U.S. president, spoke to heaps of marchers on Washington's National Mall on Wednesday to commemorate King's landmark deal with, which got here to characterize the combat for equality amongst blacks and whites in The us. …