They sum to less than 100% because this chart leaves off the undecideds. For more info, turn to Gallup itself: http://www.gallup.com/poll/21814/evolution-creati

They sum to less than 100% because this chart leaves off the undecideds. For more info, turn to Gallup itself: http://www.gallup.com/poll/21814/evolution-creationism-intelligent-design.aspx http://www.gallup.com/poll/21814/evolution-creationism-intel... They're a solid outfit with a great track record; these numbers are sadly accurate.