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We're Julia Manchester, Max Greenwood and Jonathan Easley. Here's what we're watching today on the campaign trail.

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LEADING THE DAY:

Seven candidates will take the debate stage in Charleston, S.C., on Tuesday night as the race for the Democratic presidential nomination enters a critical seven-day stretch.

Each of the seven has something on the line. Sen. Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE (I-Vt.), the nominal frontrunner in the race, is likely to face attacks from all sides, and his ability to fend off that criticism could determine whether he enters the South Carolina primary and Super Tuesday with momentum.

The debate is even more critical for Vice President Joe Biden Joe BidenMomentum growing among Republicans for Supreme Court vote before Election Day Trump expects to nominate woman to replace Ginsburg next week Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE, whose longtime frontrunner status has faded in recent weeks amid disappointing finishes in Iowa, New Hampshire and Nevada. His campaign sees South Carolina as something of a firewall for his candidacy, but there are signs that the primary there may be more competitive than previously thought.

At the same time, former New York City Mayor Michael Bloomberg Michael BloombergTop Democratic super PAC launches Florida ad blitz after Bloomberg donation The Hill's 12:30 Report - Presented by Facebook - Latest with the COVID-19 relief bill negotiations The Memo: 2020 is all about winning Florida MORE is looking to rebound from a widely panned debate performance in Las Vegas last week, where he struggled to respond to criticism of his political and business record. He's not competing in the South Carolina primary, but the debate has the potential to either boost or stall his prospects heading into Super Tuesday, when he'll first appear on ballots across the country.

Meanwhile, former South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegBipartisan praise pours in after Ginsburg's death Bogeymen of the far left deserve a place in any Biden administration Overnight Defense: Woodward book causes new firestorm | Book says Trump lashed out at generals, told Woodward about secret weapons system | US withdrawing thousands of troops from Iraq MORE and Sens. Elizabeth Warren Elizabeth WarrenBiden's fiscal program: What is the likely market impact? Warren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon MORE (D-Mass.) and Amy Klobuchar Amy KlobucharThe Hill's Morning Report - Sponsored by The Air Line Pilots Association - White House moves closer to Pelosi on virus relief bill EPA delivers win for ethanol industry angered by waivers to refiners It's time for newspapers to stop endorsing presidential candidates MORE (D-Minn.) need to appeal to black voters, who make up roughly 60 percent of South Carolina's Democratic electorate, to prove that they are capable of building the kind of diverse coalition they'll need to clinch their party's nomination and defeat President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE in the November general election.

Also joining the candidates on stage is billionaire activist Tom Steyer Tom SteyerTV ads favored Biden 2-1 in past month Inslee calls Biden climate plan 'perfect for the moment' OVERNIGHT ENERGY: Trump administration finalizes plan to open up Alaska wildlife refuge to drilling | California finalizes fuel efficiency deal with five automakers, undercutting Trump | Democrats use vulnerable GOP senators to get rare win on environment MORE, who qualified for the debate in Charleston after failing to meet the mark for the Las Vegas debate. Steyer has spent heavily in South Carolina, and it has shown in the polls. Recent surveys show him running in third place behind Biden and Bloomberg, and Tuesday night's debate will give him an opportunity to strengthen his case in the Palmetto State.

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Something else to note: Tuesday's debate will be the last one for nearly three weeks, making it all the more crucial for the candidates. A poor performance or gaffe may end up sticking with them as the nominating contest heads into Super Tuesday and beyond.

Remember to check back tonight at TheHill.com for our live coverage of the debate.

--Max Greenwood

READ MORE:

Five things to watch in the South Carolina debate, by Max

Warren is taking a crack at Bloomberg in a new ad.

Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE says she'll support the nominee -- even if it's Sanders.

Priorities USA, the largest Democratic super PAC, is going after Trump in two new ads released in battleground states.

FROM THE TRAIL:

The six Democrats competing with Sanders for the party's presidential nomination have a week left to stymie the self-described democratic socialist's rise, The Hill's Niall Stanage reports. After back-to-back wins in the New Hampshire primary and Nevada caucuses, Sanders is hoping to ride a wave of momentum into Super Tuesday, when roughly a third of delegates are up for grabs. If no other candidate emerges as a clear alternative to the Vermont senator, he could take an insurmountable delegate lead in the March 3 primaries, significantly easing his path to the nomination. Making the situation even more urgent for Sanders: despite calls from some Democrats for moderates to coalesce around a single candidate who can compete with Sanders, there's no evidence that that is about to happen. More on that below...

Sanders's rise to the front of the Democratic presidential pack and the still-crowded nature of the field's moderate lane is putting pressure on some candidates to drop out of the race, as fears mount that the Vermont senator could take an insurmountable delegate lead on Super Tuesday unless a leading alternative emerges, The Hill's Max Greenwood and Amie Parnes report. The pressure is most acute for Klobuchar and Steyer, who have yet to win a single state-wide contest. But others – Buttigieg, Warren and Biden – are also facing questions about their prospects in the race. Meanwhile, Bloomberg has yet to even appear on a primary ballot, prompting some Democrats to call for him to get out of the race and support another moderate that could take on Sanders.

Sanders's strong showing among Latino voters in the Nevada caucuses over the weekend is fueling his hopes of high turnout in California and Texas, two states that are home to half the country's Latino population and that hold their presidential primaries on Super Tuesday, The Hill's Rafael Bernal reports. Like Nevada, Texas and California host a majority Mexican American Latino voter base, which Sanders has proven more than capable of wooing. But the Vermont senator may have more trouble winning over Latinos in Florida, many of whom are Cuban American, especially after a CNN interview that aired over the weekend in which he praised the late Cuban dictator Fidel Castro for funding a literacy program.

The Democratic National Committee (DNC) is adding six states to its 2020 target list, including Texas and Georgia, two longtime Republican strongholds that have become increasingly competitive in recent years, The Hill's Marty Johnson reports. Among the other states added to the DNC's "Battleground Build-up 2020" list: Ohio, Nevada, New Hampshire and Virginia.

PERSPECTIVES:

Matt Taibbi: Russia isn't dividing us, our leaders are.

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Sally Goldenberg: Bloomberg's debate strategy: Nuke Bernie.

Dan Froomkin: A wake up call for the establishment.

The State (editorial board): Buttigieg for president.

FROM CONGRESS AND THE STATES:

Bloomberg's campaign has been sharing internal polling data with vulnerable House Democrats about how nominating Sen. Bernie Sanders (I-Vt.) would jeopardize their majority, The Hill's Jonathan Easley reports.

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Twitter has pledged to proactively verify new candidates' accounts this election cycle, but an analysis by The Hill shows that effort falling short. Read Emily Birnbaum and Chris Mills Rodrigo on how the social media platform has failed to level the playing field for candidates challenging incumbents.

POLL WATCH:

NBC NEWS/MARIST – SOUTH CAROLINA

Biden: 25 percent

Sanders: 24 percent

Steyer: 15 percent

Buttigieg: 9 percent

Warren: 8 percent

Klobuchar: 5 percent

Gabbard: 3 percent

PUBLIC POLICY POLLING – NORTH CAROLINA

Biden: 23 percent

Sanders: 20 percent

Bloomberg: 17 percent

Warren: 11 percent

Buttigieg: 9 percent

Klobuchar: 4 percent

Steyer: 3 percent

Gabbard: 1 percent

MARK YOUR CALENDARS:

There are 4 days until the South Carolina primary and 7 days until Super Tuesday.