A sign is seen in front of a child during a protest ahead of a U.S. Republican presidential candidates debate in Boulder
A sign is seen in front of a child while students and protesters gather at the "Free Speech Zone" located at the University of Colorado's Business Field as candidates gather across the street for a forum held by CNBC before the U.S. Republican presidential candidates debate in Boulder, Colorado, October 28, 2015. REUTERS/Evan Semon
A sign is seen in front of a child during a protest ahead of a U.S. Republican presidential candidates debate in Boulder
A sign is seen in front of a child while students and protesters gather at the "Free Speech Zone" located at the University of Colorado's Business Field as candidates gather across the street for a forum held by CNBC before the U.S. Republican presidential candidates debate in Boulder, Colorado, October 28, 2015. REUTERS/Evan Semon
