On Friday, Vice President Kamala Harris secured enough delegate votes in the DNC virtual roll call to become the nominee and the announcement of her running mate is imminent. In this installment of the 538 Politics podcast, the crew looks at how the contours of the presidential race have changed in the two weeks since Harris became the expected nominee. In our newly relaunched polling averages, Harris has a slim lead nationally and across the northern battleground states. Learn more about your ad choices. Visit megaphone.fm/adchoices