Psychology
Public Opinion Polling and Its Predictive Limitations
Quick fact
In the 2016 U.S. presidential election, national polls predicted a comfortable Clinton win, yet Trump won the Electoral College. A major reason: many polls failed to accurately adjust for the overrepresentation of college-educated voters and the underrepresentation of working-class voters who favored Trump.
Why this is interesting
Remember the 2016 election, when nearly every poll predicted a Hillary Clinton victory? How could so many polls be so wrong?