Obama JR got parking tickets from the Cambridge Police (how ironic), and there's an AP interview that took place in April (or so) 1991. But there are entire swaths of time when he doesn't even appear to be present at Harvard (or Columbia for that matter).
It's almost as if he were in a Foreign Exchange Program and not present at Harvard ...
I knew a woman who graduated from HLS in the same class as BHO. She got married and spent some of her final years finishing up at Columbia.
BHO's classmates to remember his presence on the campus at least some of the time. He was certainly present for the Harvard Law Review, though he -- shock -- didn't actually publish anything except for, perhaps, a minor comment related to abortion,
I have no doubt he spent a lot of his time speechifying, but am reasonably confident that he was in Cambridge, in class, most of the time, at least for the first two years (Attendance and effort in third year courses can be sketchy). He did, in fact graduate, but his Magna Cum Laude degree seems basically impossible according to what his classmates had said.