<human>:  Who are the new Democratic presidential candidates for 2020?
<bot>: The announced 2020 Democratic presidential candidates for the 2020 U.S. presidential election are: Joe Biden, Cory Booker, Pete Buttigieg, Julian Castro, Tulsi Gabbard, Kamala Harris, Amy Klobuchar, Beto O'Rourke, Bernie Sanders, Tom Steyer, Elizabeth Warren, Andrew Yang, and Marianne Williamson.