Ten candidates qualified for the debate this time around. The highest polling candidates will stand in the center. (TIME)
This will be frontrunners former VP Joe Biden and Sen. Elizabeth Warren's first time on the stage together. (TIME)
It will also be women frontrunners Sen. Kamala Harris and Warren's first time on the stage together.
Thursday's debate comes a week after CNN's "Climate Crisis Town Hall." Many expect climate change to be a major focus.
Also, you can bet on gun control being a major topic: In Aug. alone, 53 people died from mass shootings in the U.S. (NYT)
Biden recently came under fire for hosting a fundraiser with Andrew Goldman, the founder of a natural gas company. (NYT)
In June, Biden signed a "No Fossil Fuel Money" pledge to refuse money from oil and gas company executives. (NBC)
Warren, who is tied with Biden as a frontrunner in the race, could go on the offensive and bring the controversy up.
Some candidates have called for a proposed 28th Amendment limiting big money's influence on elections.
Seven presidential candidates have pledged to overturn Citizen's United as their first act as president. (NYT)