The debate has an obvious wild card. Donald Trump has proved willing to say just about anything, though his appearances in past debates have been a bit more contained than some of his speeches. Trump will be looking to shake up the race by saying or doing something dramatic, and Hillary Clinton will be watching and waiting to respond once he does. There's a sense of free-for-all here that does not normally exist around presidential debates, an apparent unusual willingness to step around the typical boundaries of such contests.
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