The CNN Poll of Polls is an average of five national surveys of the president's approval rating conducted in December: Gallup daily tracking poll (December 9-11); Bloomberg National Poll (December 7-10); NBC News/Wall Street Journal (December 6-9); Marist/McClatchy (December 4-6); Politico/George Washington University (December 2-6). The Poll of Polls does not have a sampling error.