Sources

Here are all the speeches and there associated transcriptions. I used this to search for the speech clips needed. I used youtube-dl to download the videos, ffmpeg to convert some that came in as mkv to mp4, and ffmpeg to cut down the videos into workable chunks.

https://www.youtube.com/watch?v=KpMEf4wZcEM

http://www.americanrhetoric.com/speeches/barackobama/barackobamamlkremembrancespeech.htm

https://www.youtube.com/watch?v=BNife3N3X0Q

http://www.americanrhetoric.com/speeches/barackobama/barackobamaafricancontinentreps.htm

https://www.youtube.com/watch?v=pOkayW8BG0U

http://www.americanrhetoric.com/speeches/barackobama/barackobamairaqendingcombat.htm

https://www.youtube.com/watch?v=qClN2EGKFng

http://www.americanrhetoric.com/speeches/barackobama/barackobamachamberofcommerce.htm

https://www.youtube.com/watch?v=XdFH3ctRC6g

https://www.americanrhetoric.com/speeches/barackobama/barackobamalondontownhall.htm

https://www.youtube.com/watch?v=9ZdEmjtF6HE

http://www.americanrhetoric.com/speeches/stateoftheunion2011.htm

https://www.youtube.com/watch?v=Txiiwe6Vho4

http://www.americanrhetoric.com/speeches/barackobama/barackobamaflintmichigancommunity.htm

https://www.youtube.com/watch?v=QS__1r-N9GQ

http://www.americanrhetoric.com/speeches/barackobama/barackobamapressconference10-02-15.htm

https://www.youtube.com/watch?v=gvAIvauhQGQ

http://www.americanrhetoric.com/speeches/barackobama/barackobamaselma50anniversarymarch.htm

https://www.youtube.com/watch?feature=player_embedded&v=BZuEFf6v9qo

http://www.americanrhetoric.com/speeches/barackobama/barackobamairansanctions.htm