"They are shameless," he bellowed at one of five rallies he addressed in Istanbul to wrap up a marathon campaign, referring to followers of his declared nemesis, the reclusive US-based Muslim cleric Fethullah Gulen.
He has accused the 73-year-old imam and his loyalists in the Turkish police force and justice system of being behind a spate of wiretaps and social media leaks exposing major corruption.
Erdogan and his Islamic-leaning party, in power for over a decade, Sunday face the first electoral test since being hit with the twin crises of mass protests and the graft claims spread via Twitter, Facebook and YouTube.
Erdogan urged voters to support his party and deal his foes an "Ottoman slap at the ballot box tomorrow" -- a reference to an open-handed blow to the head said to have been a combat technique of Turkey's former imperial troops.
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Undeterred, he resumed his punishing schedule Saturday in Istanbul, the megacity of more than 15 million where he was once mayor.