Petro Poroshenko has faced down protesters and rivals to lead the opinion polls before the first round of voting on Sunday Presidential hopeful Petro Poroshenko meets supporters in Uma. Photograph: Reuters For a man with presidential ambitions, it was not a propitious scene. Petro Poroshenko stood atop a bulldozer between a line of police and an angry crowd chanting expletives at him. Shouting into a loudhailer he urged calm, asking protesters to desist from storming the presidential headquarters in Kiev. Hardcore elements in the crowd didn’t like his speech; they responded with jeers of “dickhead” and “Jew trash”. (Actually, Poroshenko is a Christian.) Someone dragged him off his perch….