Turks will vote next Sunday in local polls as President Recep Tayyip Erdogan, buoyed by a strong showing in last year’s general elections, sets his sights on winning back Istanbul. The secular opposition Republican People’s Party (CHP) seized back control of the city – Turkey’s economic powerhouse – in 2019 for the first time since before Erdogan ruled it as mayor in the 1990s. Those watershed 2019 elections also saw the opposition win back the capital Ankara and keep power in the crucial Aegean port city of Izmir, shattering Erdogan’s image of political invincibility. Erdogan has entrusted hi…