The field’s four leading candidates — former Vice President Joe Biden, South Bend, Ind., Mayor Pete Buttigieg, Sen. Elizabeth Warren (D-Mass.) and Sen. Bernie Sanders (I-Vt.) — are all jockeying to deliver a strong performance at the debate, hoping to give their campaigns a burst of momentum heading into 2020 and the Iowa caucuses.

They’ll share the stage with six other candidates — Sen. Kamala Harris (D-Calif.), Sen. Amy Klobuchar (D-Minn.), Sen. Cory Booker (D-N.J.), former tech executive Andrew Yang, Rep. Tulsi Gabbard (D-Hawaii) and billionaire philanthropist Tom Steyer — all of whom are hoping for breakout moments of their own.