Greece's conservative New Democracy party was barely ahead of radical leftist Syriza party in an election that could decide whether the country stays in the euro zone, a joint exit poll by five pollsters showed on Sunday.

The poll showed New Democracy taking between 27.5 percent and 30.5 percent of the vote, while Syriza was just behind with  27 and 30 percent. They were followed by the Pasok Socialists taking 10-12 percent of the vote.

Syriza has vowed to tear up the terms of an EU/IMF bailout package keeping Greece from bankruptcy, potentially sending the country crashing out of Europe's single currency. New Democracy broadly backs the bailout. - Reuters