Antonis Samaras, president of the conservative party New Democracy, prepares to cast his vote in the town of Pylos, southern Greece, June 17, 2012. Greek political leaders cast their ballots on Sunday in crucial general elections and expressed optimism over the results of the polls that could determine Greece's economic future and membership in the European single currency zone.

Antonis Samaras, president of the conservative party New Democracy, prepares to cast his vote in the town of Pylos, southern Greece, June 17, 2012. Greek political leaders cast their ballots on Sunday in crucial general elections and expressed optimism over the results of the polls that could determine Greece's economic future and membership in the European single currency zone. [Xinhua]