On Thursday night ten Democratic candidates will face off. It's the first time former Vice President Joe Biden will face Senators Bernie Sanders and Elizabeth Warren. Plus, Trump faces a new challenger in the Republican field. This episode: White House correspondent Tamara Keith, political correspondent Scott Detrow, and national political correspondent Mara Liasson. Email the show at nprpolitics@npr.org. Find and support your local public radio station at npr.org/stations.