David Pennock writes:
http://PredictWiseQ.com is our (beta) prediction contest which aims to estimate not just the marginal probabilities of election outcomes this November, but millions of correlations among outcomes as well, like the chance Obama will win both Ohio and Florida, or the chance Romney will win if the September jobs numbers are negative. It’s a working example of a combinatorial prediction market design we published this summer in the conference ACM EC’12.
And here’s Pennock’s blog, which supplies more background.
