Kamala Harris must define herself before Donald Trump does it for her

Ms Harris needs to energise traditionally Democratic voters who have been unenthusiastic in recent years without hurting her standing with swing voters. She has already made great strides with women—especially unmarried women—younger voters, Latinos, Black voters and voters who identify as Democrats. For instance, in the Economist/YouGov poll conducted just before the debate on June 27th, Mr Biden was winning 70% of Black voters, 44% of 18- to 29-year-olds and 87% of Democrats. In the most recent Economist/YouGov poll, Ms Harris is winning 80% of Black voters, 52% of 18- to 29-year-olds and 93% of Democrats.