“The thing that strikes me more and more-and it strikes a lot of other people, too-is the extraordinary viciousness and dishonesty of political controversy in our time.  I don't mean merely that controversies are acrimonious.  They ought to be that when they are on serious subjects.  I mean that almost nobody seems to feel that an opponent deserves a fair hearing or that the objective truth matters as long as you can score a neat debating point.”

Source: Wikiquote