I've heard people make that claim many times, but I've yet to see anyone explain how BHO Sr. was an Arab. The man was as negroid as they come.
True - I’m going by what others have apparently researched. But yes, BHO Sr does not look Arab - does’t like like zero either.
There is no source.
BHO Sr. has well-known ancestry from the Luo tribe. Nobody can explain which of his ancestors was Arab.
Obama’s grandfather is described as the first person in his area to abandon the loin cloth and wear western clothes, at first converting to Christianity (presumably from animism) before he converted to Islam.
http://www.nytimes.com/2008/02/24/opinion/24iht-edkristof.1.10333269.html?_r=0