LOS ANGELES, CALIFORNIA – DECEMBER 19: Democratic presidential candidate former Vice President Joe Biden (C) speaks as (L-R) former tech executive Andrew Yang, South Bend, Indiana Mayor Pete Buttigieg, Sen. Elizabeth Warren (D-MA), Sen. Bernie Sanders (I-VT), Sen. Amy Klobuchar D-MN)and Tom Steyer listen during the Democratic presidential primary debate at Loyola Marymount University on December 19, 2019 in Los Angeles, California. Seven candidates out of the crowded field qualified for the 6th and last Democratic presidential primary debate of 2019 hosted by PBS NewsHour and Politico. (Photo by Mario Tama/Getty Images)