Mercado eleitoral

Neste site Intrade Prediction Markets podem ver as cotações de contratos de futuros para as eleições americanas.
Obama:
<img src="http://data.intrade.com/graphing/closingChart.gif?contractId=409933&intradeChart=true&transBackground=true&transBackground=true" height="225" width="460">
McCain:
<img src="http://data.intrade.com/graphing/closingChart.gif?contractId=376101&intradeChart=true&transBackground=true&transBackground=true" height="225" width="460">
Obama:
<img src="http://data.intrade.com/graphing/closingChart.gif?contractId=409933&intradeChart=true&transBackground=true&transBackground=true" height="225" width="460">
McCain:
<img src="http://data.intrade.com/graphing/closingChart.gif?contractId=376101&intradeChart=true&transBackground=true&transBackground=true" height="225" width="460">