Illustration by Thomas Kuhlenbeck / Ikon Images Where is the left’s energy and animating purpose? It is currently in power in much of Latin America and in major western countries such as the US, Germany, Spain and Australia. The UK Labour Party has a good chance of returning to government next year. But the Spanish socialists are set to lose next month’s snap election and Germany’s Social Democrats are polling behind both the centre-right Christian Democrats and, in some surveys, the far-right AfD (Alternative für Deutschland). Joe Biden is far from assured re-election, while Labour faces an uphill struggle to...