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PRESS Pass: Taylor Branch and Martin Luther King III

As the 50th anniversary of the 1963 March on Washington approaches, Martin Luther King Jr.'s eldest son, Martin Luther King III, thinks that his father's dream is "not being realized yet."

He cited issues like poverty and youth unemployment as areas where his father would "be challenging us," to make a "greater nation."

President Obama is set to speak Wednesday on the National Mall just as Martin Luther King Jr. did 50 years before.

King III said he is looking forward to President Obama's remarks and noted the uniqueness of the event. "The highest officer in our land and one of the most powerful persons in our world, the president of the United States, will be delivering a commemorative address. And I'm very excited about that."

One of the most notable parts of Martin Luther King's speech that day, historian Taylor Branch points out, wasn't actually planned - specifically, the "I have a Dream" sequence. 

"Not a word of anything that you remember the I have a dream sequence was in the prepared speech," Branch said.

"He was a master orator and he knew that this speech he worked so hard on was too stiff for this crowd. What he did was he stopped just a moment and went off on 'I have a dream...'"

Branch went as far as to call Martin Luther King Jr. a modern "founding father," saying his spirit during the Civil Rights movement was the same as the founding father's of the United States.

"[The Founding Fathers] figured out a way to promote equal citizenship and to found us on the idea that we have equal votes and equal souls. They moved us in that direction and so did Lincoln. The best highest patriots did that and that's what the civil rights movement and Dr. King did."

Watch the extended interviews with King and Branch above to hear more about Martin Luther King Jr. and what he would think about the country's first African-American President.