The Ghost At Columbia University

SEE HERE  How do you do this?  How do you go to a university and attend classes for two years with almost no-one, nadda, remembering you?  Barack Obama's stay at Columbia is so thin that there is only one other student (really his "roommate") and one professor who professes to remember him.  All his fellow students don't remember even having a glimpse of him.  Now that's really strange.  Obama continues to be the most mysterious figure in presidential history.  We'll probably find out more sometime, but by then it may be too late.