Democratic presidential candidate Dean Phillips.AP Photo/Jacquelyn MartinBiden won the South Carolina Democratic primary on Saturday, capturing over 96% of the vote.But primary challenger Dean Phillips on Sunday said that warning signs remain for Biden."He should have passed the torch," Phillips said of Biden's 2024 reelection bid.President Joe Biden on Saturday swept the South Carolina Democratic primary, winning over 96% of the vote and dominating intraparty rivals Marianne Williamson and Rep.