BBC World News America has unearthed a fascinating clip of Dr Martin Luther King speaking to the BBC's Bob McKenzie in 1964 in which Dr King predicts an African-American president "in less than 40 years."
http://news.bbc.co.uk/2/hi/programmes/world_news_america/7838851.stm
http://news.bbc.co.uk/2/hi/programmes/world_news_america/7838851.stm