Democratic presidential candidates, including Joe Biden, Elizabeth Warren, Amy Klobuchar, Tulsi Gabbard and Bernie Sanders, march in the King Day at the Dome Rally in Columbia, SC. Photo by South Carolina photographer Sean Rayford (Photo by Sean Rayford for Getty Images)

A campaign volunteer holds a sign for Joe Biden before the Jim Clyburn Fish Fry in Columbia, SC. (Photo by Sean Rayford for NPR)

Pete Buttigieg on the campaign trail in South Carolina during a canvassing kickoff event October 27, 2019 in Rock Hill, South Carolina. (Photo by Sean Rayford for Getty Images)

Democratic presidential candidate Bernie Sanders participates in teh King Day at the Dome March and Rally in Columbia, SC. Photo by South Carolina photographer Sean Rayford

Supporters of Democratic presidential candidate Cory Booker stand at the Orangeburg County Fairgrounds.

Democratic presidential candidate Elizabeth Warren with a supporter at the College of Charleston.

Democratic presidential candidate, former Vice President Joe Biden speaks to the crowd during the 2019 South Carolina Democratic Party State Convention on June 22, 2019 in Columbia, South Carolina. (Photo by Sean Rayford for Getty Images)

Comedian Dave Chappelle works at a phone bank for the Andrew Yang campaign in North Charlsston, SC.

A campaign worker for Democratic Presidential candidate Kamala Harris works in a Columbia, SC campaign office.

Democratic presidential candidate Rep. Tulsi Gabbard (R-HI) addresses the crowd during the 2019 South Carolina Democratic Party State Convention on June 22, 2019 in Columbia, South Carolina.

A woman waits for the entrance of Democratic presidential candidate, Sen. Elizabeth Warren (D-MA) at a town hall event on August 17, 2019 in Aiken, South Carolina.

Television reporters during a campaign rally for Democratic Presidential Candidate Tom Steyer

Supporters of Democratic presidential candidate Beto O’Rourke show their support for him before Rep. James Clyburn’s Famous Fish Fry.

Cory Booker speaks at Emanuel AME Church in Charleston, SC.

A woman blocks the sun using a campaign sign to block the setting sun.

Andrew Yang and Michael Bloomberg

Joe Biden

Cory Booker

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Bernie Sanders and Tom Steyer

Joe Biden gets a hug.

Amy Klobuchar at the Galivant’s Ferry Stump

Security confronts a protestor during the Galivant’s Ferry Stump.

Cory Booker listens to members of Moms Demand Action at Emanuel AME Church in Charleston, SC.

Supporters react to 2020 Democratic presidential candidate U.S. Sen. Bernie Sanders (I-VT) as he addresses the crowd at the Royal Family Life Center on March 14, 2019 in North Charleston, South Carolina.

Joe Biden

Elizabeth Warren makes a pinky promise with a young girl duringa campaign event.