Barack Osama was one of the worst presidents, He may be even worse than Bush... Look at the number of people that voted for him and look what he accomplished before... That is one hell of a stupid argument you've got there.. and that's only one person you've mentioned... What about Bill Gates, Steve Jobs, Tomas Edison, Nikola Tesla, Tons of great explorers, philosophers and mathematicians,inventors in the past.. I'm not being racist, I'm just pointing it out.
The only intelligent black person who comes to my mind is Sir William Arthur Lewis, who won the Nobel prize for Economics in 1979. I can't recall any famous black scientist, physician, astrologist, or even a software developer. Blacks are good in athletics and basketball. They should concentrate on that rather than trying to prove that they are superior to others.