Republican Presidential Debate in Simi Valley, California

Republican Presidential Debate in Simi Valley, California

Republican presidential candidates including former US Senator from Pennsylvania Rick Santorum, former New York Governor George Pataki and Senator of Kentucky Rand Paul gather for the second Republican presidential debate at the Reagan Library in Simi Valley, CA on September 16, 2015. The 15 Republican candidates met in the second prime time debate for the 2016 presidential election. Photo by Jim Ruymen/UPI