On The Gist, Jonathan Prince has helped candidates such as Bill Clinton and John Edwards prep for high-stakes debates. Now, he's got some advice for Hillary Clinton as she faces round No. 3 with the most unpredictable candidate of the modern era. Prince has worked for the Clinton and Obama administrations, but now he's the head of communications for Spotify. For the Spiel, how do you rig the most well-observed election on Earth? The answer is: You don't.

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