For $50, trust-based is OK with me.
How about this wording? "10 or more people will be killed on US soil during 2010 as the result of a deliberate attack by a party with a political goal, not overtly the act of any state". And if we hit an edge case where we disagree on whether this has been met, we'll do a poll here on LW and accept the results of the poll. Sound good?
Re: "10 or more people will be killed on US soil during 2010 as the result of a deliberate attack by a party with a political goal, not overtly the act of any state".
How come "Pakistan" got dropped? A contributing reason for the claim being unlikely was that it was extremely specific.
I would like to propose this as a thread for people to write in their predictions for the next year and the next decade, when practical with probabilities attached. I'll probably make some in the comments.