For Erdogan, coalition government and power-sharing remains anathema. It is a concept he does not understand, grasp or accept. According to Erdogan's world view, politics remains a zero-sum game of winner-takes-all.
A new constitution could change the government into a U.S.-style presidency.
The vote comes less than five months after the president appeared to lose support in a June election.
A day of voting, protests and celebrations.
"This is a success exceeding our expectations," a party official said, acknowledging the scale of the victory was a surprise.