According to what I have found, Obama did not attend Colombia University, he attended Colombia Collge which is a prep school.
I cannot find anyone there who appeared to know him either.
Columbia College is one of the schools in the Columbia University system, along with the graduate schools and Barnard College at the time. I attended Columbia College, too, but my diploma says "VNIVERSITAS COLVMBIAE" (Columbia University for those of you in Rio Linda).
I think the focus should be not on whether he graduated from Columbia or not, but what he did and under whom he studied while he was in Morningside Heights.
Columbia College is NOT a prep school. Where did you get that crazy idea?
Columbia College is an accredited four year college, founded in 1754 as King’s College. Alexander Hamilton and John Jay graudated from it. It is a member of the Ivy League.
Columbia College is not a prep school.