Separation of politics and moral ethics

Yesterday at the International Summer School in Risan (Montenegro) Emil Krijestorac (Narodna Stranka, People's Party) spoke about how certain historical developments in (political) philosophy cause many current day politicians and others to believe that moral and politics have nothing to do with one another. He started out from Socrates and Plato and went on to speak about Nicholo Machiavelli's Il Principe (The Prince). He also told about those who did believe moral and politics go together and what's more should go together, among others the protestant theologian Max Weber.