Election 2020 pc-020220-ne-demsurvey

Democratic presidential hopefuls Bernie Sanders and Tom Steyer sit at the beginning of a Martin Luther King Jr. Day rally on Jan. 20, 2020, in Columbia. Meg Kinnard/AP

COLUMBIA — Joe Biden's hold atop South Carolina Democratic presidential primary polls has never wavered over nearly a year.

But the former vice president's lead continues to slide with the South's first primary just under a month away. 

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