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Former Vice President Joe Biden thinks and Sen. Amy Klobuchar listens while Tom Steyer makes a point at the tenth Democratic presidential debate Tuesday night. Photo: Jim Watson/AFP via Getty Images.

Candidates spoke past their allotted time, punched the air, talked over each other and at times looked into the camera and directly addressed the American public and Russian President Vladimir Putin at Tuesday night's Democratic presidential debate in South Carolina, the last before Saturday's primary and Super Tuesday a few days following.

Why it matters: South Carolina's contest on Saturday is a measure of African-American support for the 2020 contenders. It's the make-or-break state for former Vice President Joe Biden after he underperformed in the first three contests. It's also a chance to check Sen. Bernie Sanders' momentum, which has eaten into Biden's lead in the state and propelled Sanders to the front of the pack.

Here's a look at the scene:

CBS News hosted Tuesday's debate in Charleston, South Carolina, with Gayle King and Norah O'Donnell moderating. Photo: Scott Olson/Getty Images.
Biden's supporters rallied for the candidate outside the debate, the Gaillard Center. Photo: Drew Angerer/Getty Images.
The candidates included billionaire Tom Steyer, who had failed to qualify for the last debate. Photo: LOGAN CYRUS/AFP via Getty Images.
Reporters watch the debate from the spin room. Photo: Logan Cyrus/AFP via Getty Images.
Sanders and Biden together on stage. Photo: Win McNamee/Getty Images.
Former second lady Jill Biden works the crowd ahead of the debate. Photo: Scott Olson/Getty Images.
Former New York Mayor Michael Bloomberg, who'd been the main target of last week's debate, took some hits. His nondisclosure agreements were raised, as well as his record on stop-and-frisk. Photo: Jim Watson/AFP via Getty Images.
Tom Steyer and Sen. Amy Klobuchar try to gain the moderators' attention to make a point. Photo: Win McNamee/Getty Images.

Go deeper: Debate night: Candidates' last face-off before Super Tuesday

Go deeper

Scoop: FDA chief called to West Wing

Stephen Hahn. Photo: Mandel Ngan/AFP via Getty Images

White House Chief of Staff Mark Meadows has summoned FDA commissioner Stephen Hahn to the West Wing for a 9:30am meeting Tuesday to explain why he hasn't moved faster to approve the Pfizer coronavirus vaccine, two senior administration officials told Axios.

Why it matters: The meeting is shaping up to be tense, with Hahn using what the White House will likely view as kamikaze language in a preemptive statement to Axios: "Let me be clear — our career scientists have to make the decision and they will take the time that’s needed to make the right call on this important decision."

Scoop: Schumer's regrets

Photo illustration: Eniola Odetunde/Axios. Photo: Mark Wilson/Getty Images   

Chuck Schumer told party donors during recent calls that the death of Ruth Bader Ginsburg and the fact that Cal Cunningham "couldn't keep his zipper up" crushed Democrats' chances of regaining the Senate, sources with direct knowledge of the conversations tell Axios.

Why it matters: Democrats are hoping for a 50-50 split by winning two upcoming special elections in Georgia. But their best chance for an outright Senate majority ended when Cunningham lost in North Carolina and Sen. Susan Collins won in Maine.

Trump's coronavirus adviser Scott Atlas resigns

Photo: Nicholas Kamm/AFP via Getty

Scott Atlas, a controversial member of the White House coronavirus task force, handed in his resignation on Monday, according to three administration officials who discussed Atlas' resignation with Axios.

Why it matters: President Trump brought in Atlas as a counterpoint to NIAID director Anthony Fauci, whose warnings about the pandemic were dismissed by the Trump administration. With Trump now fixated on election fraud conspiracy theories, Atlas' detail comes to a natural end.