ATLANTA — Less than 90 days until the Iowa caucuses, Democratic presidential candidates will take the stage Wednesday for their fifth televised debate in their march for the nomination to take on President Donald Trump.  

WHERE: The debate will be held at Tyler Perry Studios in Atlanta, Georgia.

WHEN: It will air on MSNBC from 9 to 11 p.m. and will be co-hosted by The Washington Post.

WHO: In order from left to right, Sen. Cory Booker (D-NJ), Rep. Tulsi Gabbard (D-HI), Sen. Amy Klobuchar (D-MN), South Bend, Ind., Mayor Pete Buttigieg, Sen. Elizabeth Warren (D-MA), former Vice President Joe Biden, Sen. Bernie Sanders (D-VT), Sen. Kamala Harris (D-CA), entrepreneur Andrew Yang, and activist Tom Steyer will appear on the debate stage.

Former Texas Rep. Beto O’Rourke dropped out of the race since the last debate, and fellow Texan former Housing and Urban Development Secretary Julián Castro did not qualify, along with Colorado Sen. Michael Bennet, Montana Gov. Steve Bullock and author Marianne Williamson. Former Massachusetts Governor Deval Patrick did not declare in time to make this debate.

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The much-hyped Elizabeth Warren-Joe Biden clash that was expected in the fourth debate mostly fell flat. But as the election grows nearer, they've each highlighted their respective faults. Biden has spent more time criticizing Warren's platform plans, particularly single-payer Medicare For All and a wealth tax, as well as stepping up personal attacks on her relationships with other lawmakers, calling it "just an elitist attitude, that it's either my way or the highway."

Warren has spent the last few weeks not only disagreeing with her Democratic rivals, but with a number of wealthy citizens who have come out strongly against her plans to tax more of the rich to pay for her programs. She has clashed with billionaire hedge fund manager Leon Cooperman and Facebook CEO Mark Zuckerberg, among others.  

After recovering from his heart attack, Bernie Sanders has also received a boost in his tug-of-war with Warren for progressive voters by receiving key endorsements from most of the members of a group of freshman House Democrats who are seen as leaders of the progressive movement. Reps. Alexandria Ocasio-Cortez (D-NY), Rashida Tlaib (D-MI), and Ilhan Omar (D-MN) backed Sanders for the White House. The fourth member of what President Trump has labeled "the Squad," Rep. Ayanna Pressley (D-MA), endorsed Warren. 

Continuing to hold onto the top tier is Pete Buttigieg, who has performed well in Iowa polls lately. At one point, he said he believed the race was a two-way contest between him and Warren, but later walked back those comments. He is also putting a new focus on trying to win over younger voters, as well as black voters.

What hasn't changed much since the last debate is the bottom-tier candidates' struggle for attention — and time is running out. Kamala Harris, Cory Booker, Amy Klobuchar, Tulsi Gabbard, Andrew Yang and Tom Steyer also qualified for the Atlanta debate and have begun taking steps to put most of their resources into campaigning in Iowa to make the most of the time left to them in the state. 

Impeachment Now in the Spotlight 

Since the last debate, the House of Representatives has begun impeachment hearings against President Trump over the president asking Ukraine to investigate the son of former Vice President Joe Biden, who remains a front-runner for the Democratic nomination. With Biden on the debate stage, and near-daily updates dominating national news coverage, impeachment is expected to continue being a hot topic.

Biden has been a central part of the conversation as Trump and some Republicans have attempted to pivot the impeachment inquiry to focus on the Democrat. Biden was vice president when his son Hunter was on the board of an energy company owned by a Ukrainian businessman. For months, Trump has called for more scrutiny of that period, alleging corrupt motives in the business and government work of the Biden family, without putting forward evidence of wrongdoing.

Biden has dismissed the suspicion, but debate moderators could further press him on the propriety of Hunter Biden's position.

All Democrats partaking in the debate support impeaching the president. 

The Late Arrivals 

Usually around the one-year mark before a presidential election, there are candidates dropping out of the race. This time, they're dropping in.

In the last week, a sudden presidential campaign announcement came from former Massachusetts Governor Deval Patrick and a re-consideration from former New York City Mayor Michael Bloomberg — both of whom thought about a run earlier this year. Patrick has filed to appear on New Hampshire’s first-in-the-nation primary ballot and Bloomberg has filed paperwork for some Super Tuesday primaries.

Their last-minute decisions have exposed worries some have about the dynamics of the Democratic race. With Biden still leading, but with Warren and Bernie Sanders on his heels, there has been some concern both among voters and party insiders about the “electability” of the leading candidates when put head-to-head with Trump. Biden's long political history and Warren and Sanders's progressive appeal are considered vulnerabilities by some.

Patrick has strong ties to Wall Street and deep-pocketed Democratic donors. Bloomberg is among the world’s wealthiest citizens. Both may be able to afford television advertising and other campaign operations relatively quickly.

Neither joined the race in time for this debate but could make an appearance in the December one in Los Angeles. 

This month, candidates were required to have reached 3 percent in at least four qualifying national polls since September 13 or 5 percent in two early nominating state polls since that date, while also having collected contributions from at least 165,000 unique donors, with at least 600 each in a minimum of 20 states. Some have criticized the party's requirements for debate appearance, but Democratic Party Chair Tom Perez has said throughout the process that debate slots are not rewards for the amount a campaign raises or spends, but a recognition of how much support a candidate has attracted.

Which Candidates Didn't Make It?

Former Obama administration housing chief Julián Castro is the most high-profile remaining candidate seen as falling short of the benchmarks. Former Rep. Beto O’Rourke of Texas ended his campaign last month. Those two created headlines with their earlier debate performances, including some spirited exchanges with each other.

Colorado Sen. Michael Bennet, Montana Gov. Steve Bullock and author Marianne Williamson already have missed debates.