The problem is that we don’t have time for any President to learn on the job about the U.S. Constitution.
That is why I’d be happy with Cruz as VP or Attorney General.
Also leading a bunch of lawyers isn’t the same as dealing with the incredible mix of people a POTUS has to lead. Although it is said that no one is really prepared to be POTUS I think the building a national and internaitonal business is an excellent precursor for the job.