Here are the participants:
Senator Michael Bennet of Colorado
Former Vice President Joe Biden
Senator Cory Booker of New Jersey
South Bend, Indiana, Mayor Pete Buttigieg
Former Housing Secretary Julián Castro
New York Mayor Bill de Blasio
Former Representative John Delaney of Maryland
Representative Tulsi Gabbard of Hawaii
Senator Kirsten Gillibrand of New York
Senator Kamala Harris of California
Former Governor John Hickenlooper of Colorado
Governor Jay Inslee of Washington
Senator Amy Klobuchar of Minnesota
Former Representative Beto O’Rourke of Texas
Representative Tim Ryan of Ohio
Senator Bernie Sanders of Vermont
Representative Eric Swalwell of California
Senator Elizabeth Warren of Massachusetts