"Four years ago, the Free Press and EPIC-MRA reported results of a poll the weekend ahead of that year’s Democratic [Michigan] primary that showed Hillary Clinton with a 25-point lead on Sanders, the independent senator from Vermont. It was one of several polls that showed the former secretary of state with such a lead.
"Sanders went on to win a narrow 1.4-percentage-point victory in the primary, however, as younger voters, who overwhelmingly supported Sanders, came out in much greater numbers than expected and he ran up large vote totals outside metro Detroit compared with Clinton. It was a signature surprise win for Sanders and one that Nate Silver, the founder of FiveThirtyEight.com, which analyzes statistical and polling data, said could count among “the greatest polling errors in primary history.”
The latest Free Press/EPIC-MRA poll shows Joe Biden with a 24-point lead over Bernie Sanders heading into Tuesday's Michigan presidential primary
eu.freep.com