text:  But the message, at least for now, isn't being heeded by those at the top. Speaking to CBS News after a fundraising event in San Francisco, the U.S. Vice President Kamala Harris expressed support for Mr. Biden. Joe Biden is our nominee. We beat Trump once and we're going to beat him again. Period. I am proud to be Joe Biden's running mate. Thank you. So what now? Our North America editor, Sarah Smith, explained what might come next.