The best of MLK.
These are not the ordinary white-liberal, garden-variety quotes that help assuage the guilt created by our ongoing national legacy of white-male supremacy. The image Americans want to keep of King as a gatherer rather than a hunter/revolutionary is strong medicine, the only attribute that allowed him his "national day" of honor.
Racism and imperialism don't go away just because you might wish them away, a difficult thing to imagine for career politicians and elites who thrive on divisiveness and exploitation. (Can you imagine if a vote on a King holiday would come up in Congress today? It wouldn't have a chance.)
I doubt the radical King would have been pleased with Obama, never mind the assorted racists who live at the top elsewhere in the U.S. Government.
In the months before his assassination, MLK was taking risks he knew would likely doom him.