Many people were set in place on Wednesday to help prepare for the huge event.
Stand-in actors were rehearsing with directors and camera crews to ensure everything was in place for the big debate.
Crews were also setting up the spin room, which is where reporters will talk to the candidates after the debate.
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On Thursday afternoon, 10 candidates will take the stage at Texas Southern University and argue about why they should become the next Democratic nominee for president.
The third Democratic primary debate will be hosted by ABC News in partnership with Univision.
Actors stand-in during 2020 democratic presidential debate
The debate will feature 10 candidates who were certified by the Democratic National Committee to participate:
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- Minnesota Sen. Amy Klobuchar
- New Jersey Sen. Cory Booker
- South Bend, Indiana, Mayor Pete Buttigieg
- Vermont Sen. Bernie Sanders
- Former Vice President Joe Biden
- Massachusetts Sen. Elizabeth Warren
- California Sen. Kamala Harris
- Entrepreneur Andrew Yang
- Former Texas Rep. Beto O'Rourke
- Former Housing and Urban Development Secretary Julián Castro
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SEE MORE: Debate roundup: Democratic hopefuls crisscross Texas
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