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

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

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

The men may have duked it out during the game.

CNN: Five Super Bowl moments to talk about Monday