Jeb Bush hiking in Eldorado Canyon (credit: Jeb Bush)
John Kasich
John Kasich shoots hoops at Coors Events Center (credit: CBS)
Ben Carson
Ben Carson during his flight to Colorado for the debate (credit: Ben Carson)
Rand Paul
Rand Paul with University of Colorado students in a photo featured on his Twitter post on Oct. 28, 2015 (credit: Rand Paul)
Rick Santorum
Rick Santorum lunches in Denver (credit: Rick Santorum)
Mike Huckabee
Mike Huckabee poses with deputies from Adams County (credit: Mike Huckabee)
Jeb Bush
Jeb Bush hiking in Eldorado Canyon (credit: Jeb Bush)
Carly Fiorina
Carly Fiorina (credit: CBS)
Jeb Bush
Jeb Bush on the stage (credit: John Kasich)
Boulder
An image of Boulder in a photo from Ted Cruz's Twitter feed on Oct. 28, 2015 (credit: Ted Cruz)
Republican Presidential Candidates Hold Third Debate In Colorado
Republican presidential candidate Louisiana Governor Bobby Jindal speaks to the press in the spin room at University of Colorado's Coors Events Center prior to the CNBC Republican Presidential Debate October 28, 2015 in Boulder, Colorado. Fourteen Republican presidential candidates are participating in the third set of Republican presidential debates. (Photo by Justin Sullivan/Getty Images)
Chris Christie
"Getting ready for tonight’s debate." Chris Christie wrote in a Twitter post on Oct. 28, 2015, featuring this photo. (credit: Chris Christie)
John Kasich
John Kasich on the stage (credit: John Kasich)
Republican Presidential Candidates Hold Third Debate In Colorado
Republican presidential candidate Ben Carson speaks to the press in the spin room at University of Colorado's Coors Events Center prior to the CNBC Republican Presidential Debate October 28, 2015 in Boulder, Colorado. Fourteen Republican presidential candidates are participating in the third set of Republican presidential debates. (Photo by Justin Sullivan/Getty Images)
John Kasich
John Kasich on the stage (credit: John Kasich)
Mike Huckabee
Mike Huckabee on the stage (credit: Mike Huckabee)
Ted Cruz
Ted Cruz in a photo from his Twitter feed on Oct. 28, 2015 (credit: Ted Cruz)
Jeb Bush
Jeb Bush hiking in Eldorado Canyon (credit: Jeb Bush)
Rand Paul
Rand Paul just having landed in Colorado (credit: Rand Paul)
Bobby Jindal
(credit: Bobby Jindal)
Republican Presidential Candidates Hold Third Debate In Colorado
BOULDER, CO - OCTOBER 28: Republican presidential candidate Carly Fiorina speaks to the press in the spin room at University of Colorado's Coors Events Center prior to the CNBC Republican Presidential Debate October 28, 2015 in Boulder, Colorado. Fourteen Republican presidential candidates are participating in the third set of Republican presidential debates. (Photo by Justin Sullivan/Getty Images)
Rand Paul
Rand Paul speaking in Colorado on Oct. 27, 2015 (credit: Rand Paul)
Republican Presidential Candidates Arrive In Colorado For The Debate At CU
Rand Paul speaking in Colorado on Oct. 27, 2015 (credit: CBS)
Republican Presidential Candidates Arrive In Colorado For The Debate At CU
Rand Paul speaking in Colorado on Oct. 27, 2015 (credit: CBS)
Republican Presidential Candidates Arrive In Colorado For The Debate At CU
Rand Paul speaking in Colorado on Oct. 27, 2015 (credit: CBS)
Mike Huckabee
Mike Huckabee on the stage (credit: Mike Huckabee)
George Pataki
George Pataki on stage (credit: George Pataki)
Republican Presidential Candidates Arrive In Colorado For The Debate At CU
The view from the podiums (credit: Ted Cruz/Twitter)
Republican Presidential Candidates Arrive In Colorado For The Debate At CU
A picture of the podiums (credit: Ted Cruz/Twitter)
Jeb Bush Photo
Jeb Bush hiking in Eldorado Canyon (credit: Jeb Bush)