This week, the biggest names in US Democratic politics are united in Chicago for one purpose: To give Kamala Harris the momentum she needs to defeat Donald Trump. Thus far, her campaign has been a stunning success, but can that really last until November? 

When the good vibes start to fade, what will it take for Harris to keep rolling? How will she define herself—and her opponent—this week? And in the middle of a campaign that pits anger against hope, does anybody wants to talk about actual policy?

GUEST: Jonathan Weisman, political reporter, The New York Times

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