Ted Cruz, right, speaks during an exchange with Marco Rubio, left, as Ben Carson, second from left, and Donald Trump look on during the CNN Republican presidential debate at the Venetian Hotel & Casino on Tuesday, Dec. 15, 2015, in Las Vegas.
Ted Cruz, right, speaks during an exchange with Marco Rubio, left, as Ben Carson, second from left, and Donald Trump look on during the CNN Republican presidential debate at the Venetian Hotel & Casino on Tuesday, Dec. 15, 2015, in Las Vegas. John Locher AP
Ted Cruz, right, speaks during an exchange with Marco Rubio, left, as Ben Carson, second from left, and Donald Trump look on during the CNN Republican presidential debate at the Venetian Hotel & Casino on Tuesday, Dec. 15, 2015, in Las Vegas. John Locher AP

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