Rush Limbaugh: Where are Obama's former girlfriends?

" "I got one of these email things," Limbaugh said on his program this afternoon.
"And, of course, I've only seen it a thousand times, and knew it before I received the first one. And you probably have seen this one going around. This one is, 'Where are all of Obama's former girlfriends?' It's a takeoff on where are all of the students Obama taught who claim to have been inspired by him when he taught law at the University of Chicago. Where are all of the former classmates of Obama who can tell wonderful stories about their experience with Obama on campus or in the classroom?"
 [WND]

Nobody, absolutely no one recalls Obama from Columbia where he claims he studied, and graduated.  He appears in no publicly available records (yearbooks, newsletters, housing) for those two years at Columbia.  He has refused permission for Columbia to release any records.

I have a suspicion that the reason for this is that HE WAS NOT AT COLUMBIA. 

If not, where was he for those two years after attending Occidental College, then traveling with his Pakistani friend to visit his mother in Indonesia and his friend's home in Pakistan?  Conspiracy adherents suggest Patrice Lumumba Univ. in Moscow, or CIA interpreter in Pakistan.  I don't simply know, except there is no evidence that he attended Columbia, except a statement (unsupported by documents) saying that he graduated.
[clipper]