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http://youtu.be/nlfuYrBP91URead More: LIVE Blog: March On Washington AnniversaryUpdate 2:14 p.m. MST - The Washington Post has a transcript of the…

What if Twitter existed 50 years ago, on this monumental anniversary of the March on Washington? Our answer: @TodayIn1963. We've been reporting events of the summer of '63 as if they were happening now, in real-time, through this Twitter account.

In marking the anniversary of the 1963 March on Washington, President Obama will celebrate the progress the United States has made, aides say. But he'll also talk about what's left to be done to achieve Martin Luther King's dream of racial justice — including fighting to protect voting rights.

On Aug. 28, 1963, Lewis was the youngest speaker to address the estimated quarter-million people gathered in Washington. Now a Georgia congressman, he says: "I'm not prepared to sit down and give up."

As developers "follow the money," they've got their eye on the location in Arlington, Va. It will be several years before all the approvals come in, but it's expected that the garage will soon be just a part of history, not something to see.

Clarence Jones played an integral but mostly unseen role in the 1963 March on Washington. As Martin Luther King Jr.'s legal adviser, Jones assisted in drafting King's landmark speech, and drew from a recent event in Birmingham, Ala., to craft one of the speech's signature lines.

The 1963 March on Washington was a pivotal moment in the civil rights movement. And the city those protesters marched on 50 years ago was very different from the Washington of today.

Keepers at the Smithsonian National Zoo, who were elated to report Friday that giant panda Mei Xiang gave birth to a cub, added a sad note Saturday with the news of a second cub, which was stillborn.

That sweltering August day in 1963, when almost a quarter-million people thronged the National Mall, women were relegated to the background, even as they played major roles in the movement.

Organizers say they expect 100,000 people to attend Saturday's events ahead of the Aug. 28 anniversary of the iconic "I Have a Dream" speech.