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 BidenTrump shakes up WH communications team The Hill's Campaign Report: Wisconsin votes despite coronavirus pandemic The Intercept's Ryan Grim says Cuomo is winning over critics MORE, Sen. Bernie SandersBernie SandersDrugmaker caps insulin costs at to help diabetes patients during pandemic The Hill's Campaign Report: Wisconsin votes despite coronavirus pandemic Sen. Brown endorses Biden for president MORE (I-Vt.), Sen. Kamala HarrisKamala Devi HarrisHillicon Valley: Schiff presses intel chief on staff changes | Warren offers plan to secure elections | Twitter's Jack Dorsey to donate B to coronavirus fight | WhatsApp takes steps to counter virus misinformation WhatsApp limiting message forwarding in effort to stop coronavirus misinformation The Hill's Coronavirus Report: Dybul interview; Boris Johnson update MORE (D-Calif.) and South Bend, Ind., Mayor Pete ButtigiegPete ButtigiegButtigieg launches new PAC to aid down-ballot candidates HuffPost political reporter on why Bernie fell way behind Biden Economists fear slow pace of testing will prolong recession MORE.

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Joining them will be Sens. Kirsten GillibrandKirsten GillibrandStates battle each other for equipment in supply chain crunch The Hill's Campaign Report: Biden struggles to stay in the spotlight Biden fights for attention in coronavirus news cycle MORE (D-N.Y.) and Michael BennetMichael Farrand BennetHillicon Valley: Coronavirus tracking sparks surveillance concerns | Target delivery workers plan Tuesday walkout | Federal agency expedites mail-in voting funds to states | YouTube cracks down on 5G conspiracy videos Why being connected really matters for students Democratic senator criticizes Zoom's security and privacy policies MORE (D-Colo.), Rep. Eric SwalwellEric Michael SwalwellKey House chairman cautions against remote voting, suggests other options amid coronavirus outbreak House Democrats plead with key committee chairman to allow remote voting amid coronavirus pandemic Congress tiptoes toward remote voting MORE (D-Calif.), former Colorado Gov. John HickenlooperJohn HickenlooperSenate GOP super PAC books more than million in fall ads Poll shows Daines, Bullock neck and neck in Montana Senate race Progressive challenger: How we overcame Chuck Schumer meddling MORE (D) tech entrepreneur Andrew YangAndrew YangJack Dorsey committing billion to coronavirus relief efforts Campaigns face attack ad dilemma amid coronavirus crisis Andrew Yang: Calling coronavirus 'China virus' only used to incite 'hostility' MORE and author Marianne WilliamsonMarianne WilliamsonThe Hill's Campaign Report: Biden looks to stretch lead in Tuesday contests Pelosi: 'I usually always cast my vote for a woman' Pelosi: 'We'll have a woman president' someday 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 SandersBiden and the left: Too many excuses for China The Hill's Morning Report — Presented by the APTA — Now it's Biden vs. Bernie: no endorsement from Warren 'Easy access' to Biden allowed protester to rush stage at rally 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 WarrenHillicon Valley: Schiff presses intel chief on staff changes | Warren offers plan to secure elections | Twitter's Jack Dorsey to donate B to coronavirus fight | WhatsApp takes steps to counter virus misinformation Warren releases plan to secure elections during coronavirus pandemic On The Money: Trump officials struggle to get relief loans out the door | Dow soars more than 1600 points | Kudlow says officials 'looking at' offering coronavirus bonds 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 TrumpCDC updates website to remove dosage guidance on drug touted by Trump Trump says he'd like economy to reopen 'with a big bang' but acknowledges it may be limited Graham backs Trump, vows no money for WHO in next funding bill 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 Gabbard20 House Dems call on Trump to issue two-week, nationwide shelter-in-place order The Hill's Morning Report — ,000,000,000,000: GOP unveils historic US rescue effort Gillibrand endorses Biden for president 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.