I know people hate them and hate their methodology (or lack thereof), but it is kinda funny that they were the closest pollster, giving Sanders a 1 point lead. The next closest was Selzer’s poll, giving Clinton a 3 point lead.
http://overtimepolitics.com/sanders-leads-clinton-by-1-point-in-iowa-the-day-before-the-caucuses-48-47/
http://www.realclearpolitics.com/epolls/2016/president/ia/iowa_democratic_presidential_caucus-3195.html
Final was 49.9 to 49.6 or Clinton +0.3. Overtime pollitics favored Sanders by 1.3%. Selzer’s poll favored Clinton by 2.7%.