Greece's leftist Syriza party has a 0.6 percentage point lead over the conservative New Democracy party, a Kapa Research poll for To Vima newspaper showed on Thursday. The poll showed Syriza was set to get 29 percent of the vote in a national election on Sept. 20, while New Democracy would get 28.4 percent. A previous survey by the same pollster on Sept. 12 had shown Syriza had a 0.5 percentage point lead.