How do you know that who will win?John McCain or Barack Obama?

Answer 1

The winner is determined when the votes are counted. Polls give Obama a large (9%) lead at this time, but they are often wrong.

What does "demille" have to do with the subject of your question?

Answer 2

You should look at the opinions of people who are going to lose large sums of money if they get it wrong, see here:

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