Hilary Clinton at last week's Clinton Global Initiative forum in in New York City. /PA Photos/Landov hide caption

itoggle caption /PA Photos/Landov

Reporters watch the final minutes of the presidential debate between President Obama and Republican presidential nominee Mitt Romney last October in Denver. Doug Pensinger/Getty Images hide caption

itoggle caption Doug Pensinger/Getty Images

During the 2012 campaign cycle, CNN was among several news networks that hosted Republican debates. Now, the GOP says it doesn't want to be on either that network or NBC. Joe Raedle/Getty Images hide caption

itoggle caption Joe Raedle/Getty Images