Kamala Harris attacked critics of “identity politics”. Elizabeth Warren insisted that Democrats could be both the “party of the white working class and the party of Black Lives Matter” while calling the American criminal justice system “racist”. And Cory Booker said it was time “to get folk woke”. At the Netroots Nation conference in New Orleans on Friday, leading Democratic presidential hopefuls embraced the concept of intersectionality, viewing any conflict between economic populism and racial and social justice as a false choice. “I have a problem with that phrase, ‘identity politics,’” said Kamala Harris, the junior Democratic senator from California,...