What’s my vote worth in dollars?

The Economist has invited its readers around the world to vote for McCain or Obama. I expected that Economist readers from around the world who had not been exposed (or had been less exposed) to the circus show that is American politics would lean slightly towards Obama.

They do lean towards Obama, currently at 7991 votes for Obama to 12 votes for McCain.

What do we know that Americans don’t? Or vice-versa?