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NORTH CHARLESTON, SC - JANUARY 14:  Republican presidential candidates (L-R) New Jersey Governor Chris Christie and Sen. Marco Rubio (R-FL) participate in the Fox Business Network Republican presidential debate at the North Charleston Coliseum and Performing Arts Center on January 14, 2016 in North Charleston, South Carolina. (Photo by Scott Olson/Getty Images)
NORTH CHARLESTON, SC - JANUARY 14:  Republican presidential candidates (L-R) New Jersey Governor Chris Christie and Sen. Marco Rubio (R-FL) participate in the Fox Business Network Republican presidential debate at the North Charleston Coliseum and Performing Arts Center on January 14, 2016 in North Charleston, South Carolina. (Photo by Scott Olson/Getty Images)

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