ISTANBUL – In very few democracies could such a small shift in votes lead to outcomes as different as the ones that could result from Turkey’s general election on June 7. A swing of less than 1% of the national vote could decide whether the ruling Justice and Development Party (AKP) is forced to form a coalition government – Turkey’s first after 13 years of single-party rule – leaving it unable to fulfill President Recep Tayyip Erdoğan’s longstanding desire to strengthen the presidency.