 Turks voted on Sunday in one of the most important elections in modern Turkey's 100-year history, which could either unseat President Tayyip Erdogan and halt his government's increasingly authoritarian path or usher in a third decade of his rule. The vote will decide not only who leads Turkey, a NATO member country of 85 million, but also how it is governed, where its economy is headed amid a deep cost of living crisis, and the shape of its foreign policy, which has taken unpredictable turns. Opinion polls give Erdogan's main challenger, Kamal Koliktoroglu, who heads an alliance of six opposition parties, a slight lead, but if either of them fail to get more than 50 percent of the vote, there will be a runoff election on May 28. Voters will also elect a new parliament, likely a tight race between the People's Alliance, comprising Erdogan's conservative Islamist-rooted AK Party and the nationalist MHP and others, and Koliktoroglu's National Alliance, formed of six opposition parties, including his secularist Republican People's Party, established by Turkey's founder Mustafa Kamal Ataturk. Polls opened at 8 a.m. and will close at 5 p.m. I voted today and I'm very happy to have voted in Istanbul. I see that everything is very well organized and this is a very happy thing for Turkey.