Kamala Harris passes threshold needed to become Democratic presidential nominee in DNC roll call vote  CBS NewsHarris makes history as first Black woman, Asian American presidential nominee  USA TODAYKamala Harris raised $310 million in July, dwarfing Trump haul for month  CNBC‘There’s a renewed sense of hope’: Dems crank up campaign as Harris clinches nomination  POLITICOKamala Harris officially secures Democratic nomination for president  The Washington Post