Be Wary of South Carolina Polls

First Read urges some caution about South Carolina polling, noting it often under-rates the candidate with support from older black voters.

• In 2008, the final poll margin showed Barack Obama up by 12 points, while the actual margin was Obama ahead by 29 points.
• In 2016, the final poll had Hillary Clinton up by 28 points, while the actual margin was Clinton ahead by 48 points.

If that holds this year, Joe Biden could win by a much larger margin than current polls show.