the 2020 democratic presidential candidates are back on the campaign trail after meeting face to face for the first time on the debate stage last week in miami. former vice president joe biden is defending himself after his tense exchange with senator kamala harris over race. meanwhile, senator corey booker also criticizing the current front runner over his recent comments. >> whoever our nominee is going to be, who the next president is going to be really needs to be someone who can talk openly and honestly about race, because none of us are perfect, to really call this country to common ground to reconciliation. i'm not sure if vice president biden is up to that task given the way this last three weeks have played out. >> mark meredith is in washington with more on that race. mark? >> john, tonight former vice president joe biden is facing fresh criticism as you just mentioned from fellow democrats over his record on civil rights. new jersey senator corey booker also running for president and