Republican presidential candidate and former Senator Rick Santorum is silhouetted against the background during the undercard debate held by Fox News in Des Moines, Iowa, Jan. 28, 2016. (Photo by Carlos Barria/Reuters)
Republican presidential candidate and former Senator Rick Santorum is silhouetted against the backdrop during the undercard debate held by Fox News in Des Moines, Iowa, Jan. 28, 2016. (Photo by Carlos Barria/Reuters)