Republican presidential candidates (L-R) Ohio Governor John Kasich, businesswoman Carly Fiorina, Florida Sen. Marco Rubio, retired neurosurgeon Ben Carson, businessman Donald Trump, Texas Sen. Ted Cruz, Gov. former Florida Jeb Bush, New Jersey Gov. Chris Christie and Kentucky Sen. Rand Paul take the stage during the Republican Presidential Debate, hosted by CNN, at The Venetian Las Vegas on December 15, 2015 in Las Vegas, Nevada.  AFP PHOTO / ROBYN BECK / AFP / ROBYN BECK        (Photo credit should read ROBYN BECK/AFP/Getty Images)