Kamala Harris is the Democrats’ new hope for keeping Agent Orange out of the Oval Office. It’s probably for the best. Many younger, more progressive voters saw president Joe Biden as a dinosaur, a relic of a bygone era. Among other things, Biden was an old-school drug warrior who co-wrote the 1986 Anti-Drug Abuse Act, which made the penalty for handling crack rocks a hundred times more severe than powder cocaine; the 1994 Clinton Crime Bill, which massively expanded the prison-industrial complex; and, in 2002, he proposed the Reducing Americans’ Vulnerability to Ecstasy (RAVE) Act, which would have held party organisers...