Alright, just by looking at this, I cannot tell what your premises are for your conclusion. If your conclusion happens to be:
schap
Barack Obama went to Occidental college from 1979 to 1981 and from 1981 to 1983 to Columbia university.
Then the only premises I can see that you have is the title:
schap
Obama did not go to Harvard
If this is the case, then you are committing a fallacy known as Circular Reasoning. By using a conclusion as a premis, it becomes circular. A good example of this is:
Boy: Sarah is telepathic.
Girl: How do you know?
Boy: Because she can read my mind.
This is circular because all it is saying that Sarah can read minds because she can read minds.