Someone else pointed that out here on FR the other day, I forget who it was.
Obama, regardless of questions about his birthplace and parentage, is clearly mixed race, no more than half black. He also clearly did not have an African-American upbringing. (In terms of upbringing, Bill Clinton may very well have been more "black" than Obama).
Rep. West was born black, grew up black, and seems to have made it rather inconsequential in his life.
The 5 Black US Presidents
http://www.bigissueground.com/history/blair-blackuspresidents.shtml
Were There Black US Presidents?
http://stewartsynopsis.com/Black_presidents.htm
Our First Black President?
http://www.nytimes.com/2008/04/06/magazine/06wwln-essay-t.html?_r=1
The First President Of the United States Was A Black Man (John Hanson)
http://www.freerepublic.com/focus/f-bloggers/1771850/posts