ATHENS (Reuters) - The Conservative New Democracy party defeated in Greece's national election will hold a leadership election as soon as possible, it said in a statement on Tuesday. Under interim leader Vangelis Meimarakis, the party was easily beaten into second place in Sunday's vote by the leftist Syriza party of Alexis Tsipras. (Reporting by Angeliki Koutantou; editing by John Stonestreet)