I know who Otto von Bismarck is, I understand how someone would qualify as a realist. I don't understand what a "Bismarckian realist" is. Could someone explain this concept to me in detail?
Realism is a term with thousands of definitions. In this case, this is political realism. The meaning is that politics is based on power -- ultimately physical might. This view is often called Realpolitik. Specifically, Bismarck engaged in several measured trades rather than imagining he could get everything at once.