As it happened, last week I was reading Robert Harris' historical novel Imperium, and couldn't help but be struck by this passage:
You can always spot a fool, for he is the man who will tell you he knows who is going to win an election. But an election is a living thing – you might almost say, the most vigorously alive thing there is – with thousands upon thousands of brains and limbs and eyes and thoughts and desires, and it will wriggle and turn and run off in directions no one ever predicted, sometimes just for the joy of proving the wiseacres wrong.