I think that is wishful thinking. I am not sure we would react that way. I am against abortion but I just wonder if this has ever happened before. Did Clinton speak at a Catholic University? Did Reagan who was not Catholic? Even the Bush’s were not Catholic? So how far do we go?
We go as far as the charter allows and not farther. If ND wishes to dispose of its Catholic charter, then can invite whoever is not in violation of the charter they subsequently choose. The present charter is to maintain the Cathoic character of the university. It is compatible with having speakers who are not Catholic, it is not compatible with having speakers fundamentally opposed to Catholic values.
It is not their Catholicism or lack that is the problem, it is his stance on ebryonic stem cell research and his stance on abortion, including late term ones.