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Marco Rubio, right, watches as Jeb Bush speaks during the CNBC Republican presidential debate at the University of Colorado, Wednesday, Oct. 28, 2015, in Boulder, Colo. (AP Photo/Mark J. Terrill)
Marco Rubio, right, watches as Jeb Bush speaks during the CNBC Republican presidential debate at the University of Colorado, Wednesday, Oct. 28, 2015, in Boulder, Colo. (AP Photo/Mark J. Terrill)

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Bush: My campaign not on life support

CNN's Brianna Keilar reports.

Bush: My campaign not on life support

CNN's Brianna Keilar reports.