US President Joe Biden looked set for an easy win Saturday in the Democratic primary in South Carolina, but there were signs of low turnout in this key test of support among Black voters for his reelection bid.

The southern US state launched Biden's road to the White House in 2020, and he is seeking some of the same magic four years later for a boost ahead of a likely rematch with Republican Donald Trump.

Voters were slow to arrive at a number of polling booths visited by AFP in the historic city of Charleston, with many people apparently viewing Biden's victory in South Carolina as a foregone conclusion.

"Who are the other two people on the ballot? I didn't even look," joked retiree Jane Douglas, 69, as she left a voting station at an elementary school in Charleston.

The 81-year-old incumbent has only two long-shot challengers in the poll: Minnesota congressman and gelato magnate Dean Phillips, and best-selling self-help author Marianne Williamson.

Several voters........

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