Joe Biden has finally stepped down after weeks of pressure, to contest the U.S presidential election. And he has endorsed his vice president, Kamala Harris, to run in his place. But who is she? And what does she stand for? Today, North America correspondent Farrah Tomazin, on Kamala Harris’ strengths, and weaknesses, as a presidential candidate. And what history tells us might happen next, after a sitting president pulls out of a re-election campaign.Subscribe to The Age & SMH: https://subscribe.smh.com.au/See omnystudio.com/listener for privacy information.