5 key questions ahead of Thursday's Democratic debate

MIAMI — The first night of the Democratic primary debate is in the books, and now the second round of 10 contenders is about to take the stage. 

Thursday night will be headlined by former Vice President Joe BidenJoe BidenRepublicans consider skipping witnesses in Trump impeachment trial Trump trade deal likely to sow division in Democratic presidential field Trump supporters at Pa. rally 'upset' after Democrats introduce impeachment articles MORE, Sen. Bernie SandersBernie SandersTrump trade deal likely to sow division in Democratic presidential field Buttigieg says he doubts consulting work for insurer led to layoffs Trump supporters at Pa. rally 'upset' after Democrats introduce impeachment articles MORE (I-Vt.), Sen. Kamala HarrisKamala Devi HarrisPoll: Buttigieg slips into fourth place as Biden widens lead Yang qualifies for December Democratic debate The media have fallen out of love with Bernie, but have voters? MORE (D-Calif.) and South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegTrump trade deal likely to sow division in Democratic presidential field Buttigieg says he doubts consulting work for insurer led to layoffs Biden narrowly ahead in Iowa as Sanders surges, Warren drops: poll MORE.

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Joining them will be Sens. Kirsten GillibrandKirsten GillibrandBombshell Afghanistan report bolsters calls for end to 'forever wars' Gabbard calls for congressional inquiry over Afghanistan war report Overnight Defense: Bombshell report reveals officials misled public over progress in Afghanistan | Amazon accuses Trump of 'improper pressure' in Pentagon contract decision | House Judiciary holds final impeachment hearing MORE (D-N.Y.) and Michael BennetMichael Farrand BennetTrump trade deal likely to sow division in Democratic presidential field Schumer to colleagues running for White House: Impeachment comes first Sanders urges impeachment trial 'quickly' in the Senate MORE (D-Colo.), Rep. Eric SwalwellEric Michael SwalwellLawmakers prep ahead of impeachment hearing Trump: Fox News 'panders' to Democrats by having on liberal guests Democrats could introduce articles of impeachment next week MORE (D-Calif.), former Colorado Gov. John HickenlooperJohn HickenlooperThe Hill's 12:30 Report: Impeachment enters new crucial phase Bullock drops White House bid, won't run for Senate 2020 hopes rise for gun control groups after Virginia elections MORE (D) tech entrepreneur Andrew YangAndrew YangYang to launch ad on climate change in Iowa Poll: Buttigieg slips into fourth place as Biden widens lead Yang qualifies for December Democratic debate MORE and author Marianne WilliamsonMarianne WilliamsonThe Hill's 12:30 Report — Presented by UANI — GOP, Democrats square off at final impeachment hearing Marianne Williamson roasted for claim Trump pardoned Charles Manson Democrats take in lobbying industry cash despite pledges MORE.

Here are five key questions ahead of Thursday's debate:

How much incoming fire will Biden face?

Nobody mentioned the former vice president’s name on Wednesday night, but Biden’s team believes his rivals on stage tonight are preparing to go after him.

Biden adviser Symone SandersSymone SandersSaagar Enjeti rips Biden over testy exchange in Iowa Biden gets in testy exchange in Iowa: 'You're a damn liar' Biden defends ties to former fossil fuel executive at climate forum MORE told reporters at the debate on Wednesday that she expects some contenders will take their shots but that Biden intends to stay focused on his own agenda.

“He will be focused on speaking to the American people about what he plans to do,” she said.

Biden is the clear leader in the Democratic primary, with leads stretching into the double-digits nationally and in most early state polls.

So far at least, Biden has been the Teflon candidate. He has endured several potentially damaging controversies — such as his remarks last week about being able to work with segregationist senators decades ago — but nothing has stuck to him.

Biden will look to keep rolling on Thursday night, as the other contenders are expected to go after him on everything from his vote to authorize military action in Iraq under former President George W. Bush to his defense of the credit card industry and support for a crime bill in the 1990s.

Will Sen. Sanders deliver? 

The battle to be the Democratic Party’s progressive standard bearer is heating up between Sanders and Sen. Elizabeth WarrenElizabeth Ann WarrenTrump trade deal likely to sow division in Democratic presidential field Buttigieg says he doubts consulting work for insurer led to layoffs Trump supporters at Pa. rally 'upset' after Democrats introduce impeachment articles MORE (Mass.).

Warren has been gaining on Sanders in the polls and her standout performance on Wednesday night underscores the threat she poses to his campaign.

Sanders has clearly taken notice — he took a swipe at her last week over a story about centrist Democrats rallying behind Warren because they want anyone but Sanders to be the nominee.

Some Democrats believe Sanders is being underestimated. They say his fervent base of support is stronger than is reflected in the polls and that when voters begin to cast ballots, his infrastructure and get-out-the-vote efforts will pay dividends.

But Sanders must also chase down Biden, and the pressure will be on Thursday night to remind Democratic primary voters about why they were drawn to his insurgent 2016 campaign.  

Can Buttigieg reset his campaign?

Buttigieg has been one of the biggest surprises of the 2020 primary but he enters Thursday night with a racially charged controversy threatening to consume his campaign.

It has been a tense and dispiriting week for the South Bend, Ind., mayor, who has largely been off the campaign trail to deal with an officer-involved shooting in his hometown.

Last week, Sgt. Ryan O’Neil, who is white, shot and killed Eric Logan, a black man, claiming that Logan approached him with a knife. O’Neil did not have his body camera on for the encounter.

Black leaders in South Bend have accused Buttigieg of turning a blind eye to systemic racism in the city’s police department. The incident has dredged up another controversy from his early days in office, when he demoted the city’s first black police chief.

Protesters have been confronting Buttigieg at town hall events, putting the spotlight on his management of the police department and how his decisions and policies have affected African Americans.

Buttigieg’s aides and allies say he is confronting the matter head on, canceling fundraisers and campaign events and meeting with community leaders and members of the victim’s family to hear about their concerns.

But the controversy underscores Buttigieg’s greatest challenge: attracting support from black voters, a key constituency in the Democratic primary.

Can Harris reignite her campaign?

After a promising start, Harris has faded into the background of the Democratic primary.

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The California Democrat has raised enormous sums of money and attracted thousands of people to her campaign launch.

But since then, some Democrats believe she has been too cautious and scripted. She has fallen into fourth or fifth place in the polls.

Still, many Democrats view the former California attorney general as a strong political talent, and she’ll be looking to make the case that she’s best suited to “prosecute” the case against President TrumpDonald John TrumpRepublicans consider skipping witnesses in Trump impeachment trial Bombshell Afghanistan report bolsters calls for end to 'forever wars' Lawmakers dismiss Chinese retaliatory threat to US tech MORE on Thursday night.

Will a low-polling candidate break through?

Former San Antonio Mayor Julián Castro was the biggest winner among the long shots Wednesday night, pivoting off of immigration to announce his presence in the Democratic primary.

And Rep. Tulsi GabbardTulsi GabbardGabbard knocks Trump over handling of Pensacola air station shooting Gabbard calls for congressional inquiry over Afghanistan war report The Hill's 12:30 Report — Presented by UANI — House Dems charge Trump with abuse, obstruction of Congress in impeachment articles MORE (Hawaii) was the most searched name of the night, with the Iraq war veteran raising her profile by making the case against U.S. involvement in foreign conflicts.

Which dark horse candidate will stand out on Thursday night?

Yang has a propensity for viral moments and his universal basic income proposal is bound to draw some interest.

Former Colorado Gov. John Hickenlooper and Bennet have been attacking socialism, and on Thursday night they’ll both have an opportunity to take Sanders head on.