I'm puzzled why you believe that engaging in private enterprise somehow isn't entrepreneurial. I believe it is, and I think most would agree. And, the larger point that I was making in my post was that virtually all the Founding Fathers had at least some private enterprise experience, and many were incredibly successful businessmen.
"...was decidedly academic in nature and very idealistic to boot "
Again, I'm puzzled. Why would an entrepreneur not be allowed to be idealistic or academic?
If you look at the enduring silicon valley business stories, many of the most successful entrepreneurs were not only accomplished academics, but idealists as well. Sergey Brinn and Andy Grove, come to mind immediately. In America, academia has frequently been the great incubator to many of our entrepreneurial achievements. If you examine America's greatest inventor - Edison, IMO - you're going to find a man who was wildly idealistic, on of the most active free thinkers of his generation.