You seem to be happy in your ignorance, but let me offer an analogy for you:
Suppose I am talking to a group of veterans, and I say, "Yeah, I was in Iraq, too." They would take it to mean that I fought in Iraq with the military. If they later find out that I took a vacation there 10 years before the war started, they will feel mislead. Sure, I can sit back and smugly point out that technically I didn't lie to them. But, I think in this a-political example, you would agree that I did mislead them anyway. That is the only point I'm making. Perhaps technically Obama taught constitutional law (just like I was in Iraq), but both examples are nonetheless misleading.