Click on possible answers in the right column to hide/show them on the graph. You can also hover over any line to see current value at that time. Graphs will begin to show data one hour after the question has been open. The Historical Trend chart does not display all prices ever reached since it is only updated at discrete time intervals, (hourly/daily/weekly, depending on the date range).
A market for predicting the outcome of the presidential race in each state can be found here. This market will pay out based on the number of states that that market predicts incorrectly.
If a state is rated at 50 percent exactly (which is unlikely) that Mitt Romney will win that state, that will be considered a prediction that Romney will win.
The creator of this market will not participate in this market until after the state-by-state market closes.
Note: If, in the sole evaluation of the creator of this market, there is evidence that the state-by-state market is being manipulated to influence this market, this market will be refunded. A blatant example would be last-minute trading that leads to a prediction that Obama wins Utah or Romney wins the District of Columbia.