You seem to think that teaching a class tells us something important.

Correct. In the context of a presidency, along with his words, I believe we can infer a regard for the Constitution. And Obama made essentially this point. Take a look at an excerpt from a speech by President Obama on national security:

We are building new partnerships around the world to disrupt, dismantle, and defeat al Qaeda and its affiliates. And we have renewed American diplomacy so that we once again have the strength and standing to truly lead the world. These steps are all critical to keeping America secure. But I believe with every fiber of my being that in the long run we also cannot keep this country safe unless we enlist the power of our most fundamental values. The documents that we hold in this very hall - the Declaration of Independence, the Constitution, the Bill of Rights -are not simply words written into aging parchment. They are the foundation of liberty and justice in this country, and a light that shines for all who seek freedom, fairness, equality and dignity in the world.

I challenge you to find any reference Bush made to any of the above documents at any time while on the subject of national security where he is clearly expressing a regard for the document(s) as a guide.