The evolving fight for the soul of the Democratic Party moves to California on Thursday as a shrinking field of presidential contenders takes the debate stage for a sixth and final time in 2019.

It is a debate set in the heart of the holiday season and overshadowed by Congress’ historic impeachment vote, raising the prospect that it may draw the smallest audience yet. But the stakes are not small in the broader tug-of-war between passionate progressives and pragmatic moderates who are battling over the party’s positions on core issues like health care, immigration, education and trade.

Watch the debate below: