. >> host: barack obamathe story, how many interviews did you do? >> almost 400. i have a wonderful assistant, in specific parts of the story. traveled all around the world. everybody i could find in every part of the life of president obama and his parents and grandparents. >> host: barack obama sr. was born in 1936. what was his childhood like? >> from a fairly early age was dealing with western culture. he was a very smart kid. his father was difficult to get along with and not often there. mostly in nairobi and barack was growing up -- he was lucky in the sense that he was smart enough to get into the only good school in that area. although he never totally finished, he was a very smart student and you have that sort of clash of old and new and his generation had to deal with it. for all his youth and adolescents living in colonial country in a very for part of kenya, he lived in mud huts and goats and cows and no television or anything like that. almost a century behind in some ways and yet kenya was starting to reemerge during all of -- the rebellion was beg