Kamala Harris’s presidential campaign is recruiting Deborah Mattinson, a former strategy director to Britain’s far-left prime minister, Sir Keir Starmer. Mattinson will head to Washington, D.C., to brief the Harris campaign on Starmer’s Labour Party’s victory in Britain’s July 4 snap election, which returned them to power after 14 years in opposition. Mattinson’s approach focused on persuading traditional Labour voters, who had abandoned the party over its embrace of mass migration and woke ideology, to return to the fold. Harris, who previously advocated far-left policies such as banning fracking, decriminalizing illegal border crossings, and defunding the police, likely hopes a...