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The President obviously won't have time to answer all 12,000 questions that have been sent in, but he'll get to as many as he can. He won't know which questions will be asked until he hears them during the interview. All the submissions are visible at CitizenTube, though, and users can vote for which ones they'd like answered, so the questions we hear in the webcast should be a finger on the pulse of the nation — or at least the pulse of the citizens who are interested in a webcast Q&A.