This market will resolve to the time period when the next impeachment trial in the Senate begins. An impeachment trial in the Senate will begin for the purposes of this market the moment that the Senators are sworn in for the purposes of an impeachment trial.
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Should there be a dispute, the rules provided will control over the answer to the question itself. While, the question is intended to provide an easy way for people to bet on their beliefs, it is not the end-all be-all, and all traders should look at the rules. Please don't hesitate to ask clarifying questions in the comments. In the unlikely event of significant ambiguity regarding whether the resolution criteria have been met. I reserve the right to resolve a question to a percentage that I deem fair. I will give notice before I do this.