From Forbes on August 22, 2016:

Newly released research by Drs. Martin Block and Don Schultz of the Medill School of Integrated Marketing Communications at Northwestern University has uncovered a significant group of potential voters who represent 30% of the population and may have not been analyzed before. As a result, this group may play a significant role in determining the upcoming presidential election. Continue reading…

New Research Uncovers Voters Who May Not Be Participating In Polls — And May Determine Election