The dream marches on: Looking back on MLK's historic 1963 speech

Tomorrow marks the anniversary of a speech truly for the ages. Our commentary is from columnist Charles Blow of The New York Times:

Sixty years ago, on August 28, 1963, the centennial year of the Emancipation Proclamation,  an estimated 250,000 people descended on Washington, D.C., for the March on Washington for Jobs and Freedom.