NEW : Obama : `` We 've got to keep pushing for what ought to be '' the right thing to do. " Speakers at the ceremony urge the pursuit of economic justice . Celebrated writer Maya Angelou says King has been edited to make him seem arrogant .
NEW : Obama : `` We 've got to keep pushing for what ought to be '' King 's children urge that his ideals and values be remembered . Speakers at the ceremony urge the pursuit of economic justice . Celebrated writer Maya Angelou says King has been edited to make him seem arrogant .