LyrArc Article Gist
In all elections since 2002 Mr. Erdogan has prevailed except June 2015. Much of the support for Erdogan is a result of economic gains by Turkey including 70% rise in per capita incomes since 2003. 

These gains are under threat now because of heavy dependence on foreign investment and the decline of the currency Lira from 2.15 to the dollar in 2014 to 4.50 to the dollar in June 2018, losing half its value since the election of 2014. Experts say recent developments in Turkey have dented investor confidence, with investors uncertain about Mr. Erdogan's plans.

The presidential candidate most likely to face Erdogan in a runoff election if Mr. Erdogan does not get 50% of the vote on June 24 is Mr. Muharrem Ince. Ince says he sees a wind of change, saying Turks are "very tired of this one-man regime" and that unlike before the economic trouble is so severe and harder to cover. This time the opposition is better coordinated and the secular CHP Party which was once dominant after Ataturk, is running in an alliance with traditional Islamist party Saadet, and with new secular nationalist Iyi party.

Erdogan has called early elections a year and half ahead of time because he sees the economic troubles are at an early stage and his AKP Party would do better now than in 18 months when the economy may be in worse shape than it is now.