The debate will be hosted by CBS News and the Congressional Black Caucus Institute, in partnership with Twitter, on Tuesday in Charleston, S.C. It starts at 8 p.m. EST.

He’ll join six other candidates on the debate stage, all of whom participated in last week’s debate: Joe Biden, Mike Bloomberg, Pete Buttigieg, Amy Klobuchar, Bernie Sanders and Elizabeth Warren.

Candidates could qualify one of two ways: by winning a delegate to the national convention out of Iowa, New Hampshire or Nevada or earning at least 10 percent in at least four DNC-approved polls (or 12 percent in two polls in South Carolina). Steyer is the last candidate expected to qualify for the debate.

In the CBS News/YouGov poll, conducted before Sanders’ runaway victory in Nevada, Biden is at 28 percent in South Carolina. Sanders is at 23 percent and Steyer has 18 percent. Warren is at 12 percent and Buttigieg is at 10 percent, the last candidate in double digits.

Most other candidates have earned at least one delegate, according to POLITICO’s tracking of public polling and delegate counts . Bloomberg — who is not campaigning in the early states — has not earned a delegate but qualified for the debate based on his strength in national polls.

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Steyer had two middling performances in Iowa and New Hampshire, failing to break 5 percent support in either, well below the level of support required to win a delegate to the national convention. With around 60 percent of Nevada's precincts reporting as of Sunday morning, Steyer had only 4 percent of county delegates, making it unlikely he'll earn a national delegate.

His camp has maintained that he is much better positioned in Nevada and South Carolina, where he has poured millions of his own money than the first two states. He has overwhelmed the latter two with advertisements and field staff, while other campaigns largely focused on battling it out in the first two early voting states.

Steyer, in particular, has honed in on South Carolina . His campaign is one of the most free-spending campaigns in the history of the state’s first-in-the-South primary, where he has one of the largest field staffs and an unmatched amount of advertising.

After Tuesday, the next debate will not be for another three weeks , on March 15 in Phoenix. It is two days before Arizona’s primary and well after Super Tuesday, when the field will almost assuredly be smaller.

The CBS News/YouGov poll was conducted Feb. 20-22 and surveyed 1,238 likely Democratic primary voters. The margin of error is plus or minus 5.5 percentage points.