It's only the second time such a debate has taken place -- Democratic candidates duked it out in a similar format this past summer.
CNN: The story
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Now executive chairman of cme Group, Duffy, 49, has duked it out with rivals--as well as with friends and customers--to create the world's biggest financial exchange.
FORBES: Up From the Pits
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The Herbalife drama continues to unfold, taking on Hollywood-esque tones as investors Bill Ackman and Carl Icahn duked it out on live television.
FORBES: Investors Side With Carl Icahn: Herbalife Soars After Epic TV Battle With Ackman