During election season, polls tell us who’s ahead in races and voters’ opinions. But the way polls are conducted is changing. According to Pew Research Center, 61% of national pollsters made changes in their polling methods between 2016 and 2022. That includes the emergence of online opt-in polling. Andrew Mercer is a principal methodologist at Pew. He joins Soledad O’Brien to explain how the new polling method could produce misleading results. 

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