He didn't really go to Columbia.  But he did go to Harvard.  Harvard is a VERY easy school once you get in there.  Remember he was the first Black President of the Law Review.  He hardly wrote any letters in the law review but when he did it showed him out to be a horrible writer  https://www.americanthinker.com/articles/2011/08/early_obama_letter_confirms_inability_to_write.html