I don't think the quotes correspond to percentage of popular vote. Rather they represent odds for a bet. You have to bet 52.5 cents to win a dollar on Tuesday when Bush wins, or 47.5 cents to collect a dollar for a Kerry victory.
You may be thinking of the "Winner Take All Market". This is the "Vote Share Market". Two differant birds.
From the site:
Payoffs in the 2004 Presidential Vote-Share Market will be determined by the percentage of the total two-party popular vote received by the Democratic and Republican candidates in the 2004 U.S. Presidential Election. For instance, contracts for a candidate who receives 32.4% of the popular votes cast for the Democratic and Republican nominees, will be worth 32.4 cents each .link
This is a "vote share" pool, as distinct from the popular vote winner pool. See the link in #4.
The market says that Bush's share of the two-party vote will be roughly 52.5%.
So the total of the two contracts on each party are the odds that Kerry will win, and Bush will win, respectively.
Congressman Billybob
No. This one is vote-share market. We usualyl post the "odds of winning" chart. This is the one that was within 0.2% in the last three elections.