Always strive to learn something useful. --Sophocles

Once again, from the web comic Pibgorn:
Politicians are of three fundamental kidneys:

1. The Ethical Being
The ethical being knows the difference between truth and mendacity, but, crippled by his regard for the trust placed in him by his constituents, speaks the truth – a commodity the electorate extol in principle, abhor in practice. For the sake of convenience – the concept of an ethical politician being unwieldy and elusive – he is usually known by the word “liar.”

2. The Pragmatic Being
The pragmatic being knows with pellucidity the difference between truth and deceit, always choosing deceit because there is no tactical advantage in the truth. He is usually referred to as “the incumbent.”

3. The Stupid One
The stupid one cannot tell the difference between truth and falsehood, prating his myriad lies with heartfelt incongruity. It is a long shot indeed that the stupid one will ever utter the truth, the odds against such an accident being infinite: he hedges his bet with a broad, manipulative smile and a brisk handshake. According to custom, he is claimed a “visionary.”