2020 primary debate guide: Everything you need to know ahead of the October showdown

2020 primary debate guide: Everything you need to know ahead of the October showdown
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Twelve Democratic primary hopefuls are gearing up to take the stage Tuesday night at Otterbein University in Westerville, Ohio, for the fourth Democratic primary debate, in what is being billed as the largest single debate in a U.S. presidential campaign cycle. 

CNN and The New York Times will host the forum, which will air from 8 p.m. to 11 p.m. EDT. 

Who will be there? Who won't? What questions will the candidates be asked? Who will jab at whom? What will we learn?

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Keep reading for everything you need to know for the fourth 2020 Democratic primary debate.

Who will be there, and in what order? 

In order of stage placement: 

— Rep. Tulsi GabbardTulsi GabbardSanders reclaims second place in new 2020 poll New poll catapults Buttigieg to frontrunner position in Iowa Deval Patrick: a short runway, but potential to get airborne MORE (D-Hawaii)

Tom SteyerThomas (Tom) Fahr SteyerPoll: Biden holds 20-point lead in South Carolina Sanders reclaims second place in new 2020 poll Progressive group to spend as much as M to turn out young voters MORE

— Sen. Cory BookerCory Anthony BookerJayapal hits back at Biden on marijuana 'prohibition' Poll: Biden holds 20-point lead in South Carolina Fox News anchor apologizes for saying Booker dropped out of 2020 race MORE (D-N.J.)

— Sen. Kamala HarrisKamala Devi HarrisJayapal hits back at Biden on marijuana 'prohibition' Poll: Biden holds 20-point lead in South Carolina Fox News anchor apologizes for saying Booker dropped out of 2020 race MORE (D-Calif.)

— Sen. Bernie SandersBernie SandersRahm Emanuel: Bloomberg, Patrick entering race will allow Democrats to have 'ideas primary' Feehery: Pivoting to infrastructure could help heal post-impeachment wounds Jayapal hits back at Biden on marijuana 'prohibition' MORE (I-Vt.)

— Former Vice President Joe BidenJoe BidenMost Americans break with Trump on Ukraine, but just 45 percent think he should be removed: poll Democrats release two new transcripts ahead of next public impeachment hearings Press: Ukraine's not the only outrage MORE 

— Sen. Elizabeth WarrenElizabeth Ann WarrenRahm Emanuel: Bloomberg, Patrick entering race will allow Democrats to have 'ideas primary' Feehery: Pivoting to infrastructure could help heal post-impeachment wounds Jayapal hits back at Biden on marijuana 'prohibition' MORE (D-Mass.)

— South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegThe Memo: Centrists change tone of Democratic race Poll: Biden holds 20-point lead in South Carolina Sanders reclaims second place in new 2020 poll MORE 

Andrew YangAndrew YangJayapal hits back at Biden on marijuana 'prohibition' Sanders reclaims second place in new 2020 poll MSNBC apologizes after leaving Yang out of presidential poll graphic MORE 

— Former Rep. Beto O’Rourke (D-Texas)

— Sen. Amy KlobucharAmy Jean KlobucharHillicon Valley: Commerce extends Huawei waiver | Senate Dems unveil privacy bill priorities | House funding measure extends surveillance program | Trump to tour Apple factory | GOP bill would restrict US data going to China Fox News anchor apologizes for saying Booker dropped out of 2020 race Klobuchar unveils plan to secure elections as president MORE (D-Minn.)

— Former Housing and Urban Development Secretary Julián Castro

What are people saying about the stage placement? 

Biden, Sanders and Warren are center stage for the second debate in a row, reflecting their leads in the polls. 

That will give all three another chance to contrast their progressive and centrist ideas, at a time when Warren is posing a growing threat to Biden’s front-runner status while Sanders retains strong support.

What topics could come up?

Impeachment 

Tuesday will mark the first time Democratic presidential hopefuls will address the issue of impeachment after Speaker Nancy PelosiNancy PelosiFeehery: Pivoting to infrastructure could help heal post-impeachment wounds Key GOP senator: 'We need a breakthrough' on spending talks Overnight Defense — Presented by Boeing — Stopgap spending bill includes military pay raise | Schumer presses Pentagon to protect impeachment witnesses | US ends civil-nuclear waiver in Iran MORE (D-Calif.) launched a formal impeachment inquiry. Most candidates back impeachment. 

Syria pullout  

While foreign policy does not always take center stage at debates, the candidates are likely going to face questions on Trump’s decision to withdraw troops from northern Syria, which Democrats and Republicans have both criticized. The move is seen by critics as an abandonment of U.S. Kurdish allies that will put their lives at risk. 

Affording higher education  

Student loan and debt forgiveness have been frequently discussed on the campaign trail. Warren and Sanders have both proposed four free years of college education. Biden released his plan proposing two free years of college education last week, and the two progressive senators could see an opening to hit the former vice president on that plan.  

Health care 

Health care is shaping up to be the biggest policy debate in the party. Biden clashed with Warren and Sanders on the issue at the last debate, defending the Affordable Care Act in the face of progressive proposals to scrap it in favor of "Medicare for All." 

Drugs  

Democrats could also address the ongoing opioid crisis in the U.S., which has hit Ohio especially hard. The Centers for Disease Control and Prevention found that the state was home to the nation’s highest per capita rate of opioid overdoses in 2017. 

Vaping

Vaping and e-cigarettes could also come up during the debate, amid a growing number of deaths related to the practice.  

Jobs and the economy 

Trump promised to revamp Ohio’s manufacturing and agricultural sector in 2016. However, Democrats say that the president has not made good on those promises in the state. Expect the Democratic candidates to push their own economic messages at the debate.  

Who won’t be there? 

— Sen. Michael BennetMichael Farrand BennetFox News anchor apologizes for saying Booker dropped out of 2020 race Klobuchar unveils plan to secure elections as president New poll catapults Buttigieg to frontrunner position in Iowa MORE (D-Colo.) 

— Montana Gov. Steve BullockSteve BullockDeval Patrick: a short runway, but potential to get airborne Biden, Buttigieg condemn rocket attacks on Israel Press: Another billionaire need not apply MORE (D)

— Former Rep. John DelaneyJohn Kevin DelaneyPoll: Biden holds 20-point lead in South Carolina Deval Patrick: a short runway, but potential to get airborne Delaney to take message to Iowa voters on Sunday with infomercial MORE (D-Md.) 

— Miramar, Fla., Mayor Wayne MessamWayne Martin MessamThe Memo: What the leading 2020 Dems need to do Wayne Messam raised this quarter for presidential run The Hill's 12:30 Report: Hunter Biden speaks out amid Ukraine controversy MORE  

— Rep. Tim RyanTimothy (Tim) RyanThe Hill's Campaign Report: Late bids surprise 2020 Democratic field Tim Ryan endorses Biden for president Strategists say Warren 'Medicare for All' plan could appeal to centrists MORE (D-Ohio) 

— Former Rep. Joe Sestak (Pa.)

Marianne WilliamsonMarianne Williamson 2020 Democrats demand action on guns after Santa Clarita shooting Williamson announces poverty plan with support for universal basic income, minimum wage Yang seeks donations for 2020 rival Marianne Williamson: 'She has much more to say' MORE 

Where can I watch the debate? 

The debate will air on CNN, CNN International, CNN en Español, in addition to streaming live on CNN.com and NYTimes.com’s homepages. 

 Hill.TV will stream a live 30-minute pre-show, as well as a post-debate show on The Hill’s YouTube channel.