White House hopefuls will be in the spotlight Tuesday night in Ohio for the fourth Democratic primary debate. With a dozen candidates, it will be the most crowded presidential stage ever, according to debate co-host the New York Times.

How to watch

CNN and the New York Times’ Democratic presidential debate will air at 8 p.m. EST on CNN, CNN en Español and CNN International. It will stream on CNN.com’s homepage and NYTimes.com.

The debate will be held at Otterbein University in Westerville, Ohio.

The lineup

Former Vice President Joe Biden will stand center stage, flanked by Vermont Sen. Bernie Sanders on his right and Massachusetts Sen. Elizabeth Warren to his left.

Stage order was determined by polling, with the top-tier candidates toward the center.

Rounding out the middle will be South Bend, Indiana, Mayor Pete Buttigieg, businessman Andrew Yang, California Sen. Kamala Harris, New Jersey Sen. Cory Booker, former Texas Rep. Beto O’Rourke, Minnesota Sen. Amy Klobuchar and billionaire Tom Steyer.

Rep. Tulsi Gabbard will stand at the far left. Former Housing and Urban Development Secretary Julián Castro will be at the far right podium.

How the candidates qualified

Like the third debate, candidates needed to attain at least 2 percent in four separate DNC-approved polls and receive contributions from at least 130,000 unique donors. Steyer and Gabbard didn’t make the cut at the September debate, but qualified for Tuesday’s debate with the extra time.

Who will moderate

CNN anchors Erin Burnett and Anderson Cooper and New York Times national editor Marc Lacey will moderate the debate.

What to watch

It’s the first Democratic debate since the House launched an impeachment inquiry into President Trump for asking Ukraine to investigate Biden and son Hunter’s business dealings in Ukraine. So far, the Democrats have focused their attention on Trump’s alleged impeachable offenses. But will any offer criticism of Joe and Hunter Biden, who announced Sunday he’ll resign from the board of a Chinese company?

Sanders will also be in the spotlight after suffering a heart attack recently. And Warren has cemented her status as a front-runner, so she may expect more incoming. The Sanders campaign has been trying to draw distinctions between her billionaire donations and embrace of capitalism.

Steyer will make his debate debut with a topic he’s very familiar with. He’s been an early leader on impeachment of the president and launched a nationwide campaign to get the public on board. He’s also a billionaire, and Sanders and Warren have been quick to target the ultra-wealthy with their policies.

Biden has taken a lot of attacks at previous debates — first from Harris and then Castro. But those attacks have not translated into lasting movement in the polls. Will other candidates take shots?

Yang, on the other hand, has gotten little time on the debate stage but has maximized some buzzy moments.