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The Supervisor, the Champion, and the PromoterWhat psychological personality tests reveal about Clinton, Obama, and McCain.

By Emily YoffePosted Wednesday, Feb. 20, 2008, at 6:50 AM ET

Emily Yoffe was online on Feb. 21 to chat with readers about this article. Read the transcript.

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Emily Yoffe is the author of What the Dog Did: Tales From a Formerly Reluctant Dog Owner. You can send your Human Guinea Pig suggestions or comments to .
Illustration by Mark Alan Stamaty.
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