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, former Gov. Florida Jeb Bush, New Jersey Gov. Chris Christie and Kentucky Sen. Rand Paul take the stage at the start of the Republican Presidential Debate, hosted by CNN, at The Venetian Las Vegas on December 15, 2015 in Las Vegas, Nevada. (ROBYN BECK/AFP/Getty Images)