I find Mark Simone to be an excellent commentator on subjects with which he's well versed, but in some cases, he's less well-informed than your average Democrat sheeple. This is one of them.
Obama was never a "professor", and is not an "expert" on Constitutional Law. It's not an area that he has any expertise in. There have literally been reams of data posted on this website that utterly refute that claim.
It's nothing more than an overblown liberal propagandist's exaggeration of his college and university track, meant to burnish his woefully thin credentials, and has no basis in fact.
You and I know more about the US Constitution than Obama ever has, or ever will.