Barack Obama's speach in tribute to Martin Luther King Jr.:
http://www.telegraph.co.uk/news/worldnews/barackobama/10272306/50-years-on-Obama-stands-on-the-shoulders-of-Martin-Luther-King.html
Full transcript: Obama on 'I Have a Dream'
http://www.cnn.com/2013/08/28/politics/obama-king-speech-transcript/index.html
http://m.washingtonpost.com/politics/transcript-president-obamas-speech-on-the-50th-anniversary-of-the-march-on-washington/2013/08/28/0138e01e-0ffb-11e3-8cdd-bcdc09410972_story.html
http://www.theguardian.com/world/2013/aug/28/barack-obama-speech-full-transcript
