This article from 2012 talks about how incorrect exit polls have been in the past and a little bit of the why: http://www.theguardian.com/commentisfree/2012/ju

This article from 2012 talks about how incorrect exit polls have been in the past and a little bit of the why: http://www.theguardian.com/commentisfree/2012/jun/06/outraged-wisconsin-exit-polls-so-wrong http://www.theguardian.com/commentisfree/2012/jun/06/outrage... From WaPo: https://www.washingtonpost.com/news/the-fix/wp/2016/04/22/how-exit-polls-work-explained/ https://www.washingtonpost.com/news/the-fix/wp/2016/04/22/ho... Another good one: http://www.mysterypollster.com/main/2004/12/what_is_the_sam.html http://www.mysterypollster.com/main/2004/12/what_is_the_sam....