Support WBURTurkey's president has built vast power over 20 years. But he may lose on SundayUpdated May 14, 2023Larry KaplowPeter KenyonfacebookEmailA poster of President Recep Tayyip Erdogan, left, on a truck near an election poster of presidential candidate Kemal Kilicdaroglu in Istanbul, Turkey, May 8. (AP)This article was originally published on May 12, 2023.