Biden has led all five Post and Courier-Change Research polls taken since February by an average of 22 percentage points. His lead in South Carolina is the largest among the primary’s early-voting states.

Vermont Sen. Bernie Sanders was third, at 16 percent, in the latest online survey of likely S.C. Democratic primary voters taken from Aug. 9-12, followed by California Sen. Kamala Harris at 12 percent.

South Bend Mayor Pete Buttigieg, the race’s surprise hopeful, took the biggest hit from the June poll, falling from third place to fifth at 5 percent.

New Jersey Sen. Cory Booker, who has held more events in South Carolina than any other candidate, remained in sixth place for the third straight poll at 4 percent.

Hawaii congresswoman Tulsi Gabbard, whose campaign has plastered billboards across the state, nabbed the last spot held by a candidate receiving more than 1 percent of support.

Former Texas congressman Beto O’Rourke, once as high as fourth place in South Carolina, found himself with six other candidates, including businessmen Tom Steyer and Andrew Yang, polling at 1 percent.

The Post and Courier-Change Research poll surveyed 521 likely Democratic voters and had a margin of error was plus or minus 4.3 percent.  […]