(Bloomberg) -- Turkey is set to head to a runoff in a vote that’s become the strongest electoral test yet of President Recep Tayyip Erdogan’s two decades in power. Most Read from BloombergTurkey Latest: Erdogan Says Unclear If Vote Will Go to RunoffRemote Work Comes With Daytime Drug and Drinking HabitsTurkey Poised for Vote Runoff as Erdogan Ballots Fall ShortChina Jails 78-Year-Old American for Life on Spying ChargesWhile preliminary results Monday showed Erdogan with a lead of more than 2 mil