Former Vice President Joe Biden and Sen. Bernie Sanders lead the latest South Carolina poll of Democratic voters, garnering double-digit support that far outpaces the rest of the pack.

Support appears to have collapsed for climate activist and billionaire Tom Steyer, who had been polling in the low double digits after saturating the Palmetto State with campaign advertising. Steyer now polls at just 7%.

The numbers were released by Public Policy Polling and show Biden with a robust lead over Sanders with 36% to 21%.

“PPP’s newest poll of Democratic primary voters in South Carolina finds it looking like a two-person race, with only Joe Biden and Bernie Sanders reaching double digits in their support,” Public Policy Polling Director Tom Jensen said.

The poll is good news for Biden, who had declared South Carolina's Feb. 29 primary a “firewall” for his campaign and will follow his second-place but distant finish behind Sanders in the Feb. 22 Nevada caucuses.

“The key to Biden’s success continues to be strong support from African Americans. He gets 50% to 21% for Sanders, with no one else polling above 6%,“ Jensen said.

The poll shows the remaining Democrats on the ballot in South Carolina trailing far behind Biden and Sanders.

The survey found Sen. Elizabeth Warren with 8% support, Pete Buttigieg with 7%, Tulsi Gabbard with 6%, and Amy Klobuchar with just 3%.

Sanders leads Biden with voters under 45, but Biden enjoys a 32-point lead among seniors with 40% to 8%.

The poll found Klobuchar with just 1% of the all-important African American vote.

“Plenty could happen to change things in the next five days, but, for now, it looks like Biden’s position might be shoring up a little bit in South Carolina,” Jensen said.

The poll was conducted from Feb. 23 to 24 and surveyed 866 likely Democratic primary voters.