CNN 's national poll of polls is composed of the following six national general election surveys of likely voters : Pew ( October 16-19 ) , CNN / ORC ( October 17-19 ) , ABC / Washington Post ( October 16-19 ) , Reuters / C-SPAN / Zogby ( October 18-20 ) , Gallup ( October 18-20 ) and Diageo / Hotline ( October 18-20 ) .