DES MOINES, Iowa (AP) – Democrats are preparing for what could be their most contentious debate yet. The six candidates on the stage Tuesday night are all looking for a way to break out of the crowded pack at the top with just weeks to go until the Iowa caucuses.

Bernie Sanders, Elizabeth Warren, Amy Klobuchar, Joe Biden, Pete Buttigieg and Tom Steyer will all appear at the debate. It marks the first all-white debate stage of the cycle, which is sure to underscore concerns among Democrats at the lack of diversity in the field.