6 things to look for in the final Democratic debate of 2019

Los Angeles (CNN)The final Democratic primary debate of 2019 is one of the best opportunities left for the seven Democrats slated to appear here in California on Thursday to leave voters in Iowa and across the country with a good impression before voting begins in 2020.

A host of Democratic primary storylines will play out when the candidates take the stage: Is there anything that can knock former Vice President Joe Biden off the top? Will a rising Sen. Bernie Sanders and stumbling Sen. Elizabeth Warren stay friendly? Will the tumultuous last three weeks for South Bend, Indiana, Mayor Pete Buttigieg play out on the stage?