NEW YORK (TheStreet) -- The National Bank of Greece shares continue to fall on Thursday, down 7.3% to $1.84 in trading, as Greek stocks, especially banking stocks, suffer in the wake of Prime Minister Antonis Samaras' announcement that the country will hold presidential elections next week, two months earlier than scheduled. If Samaras' party candidate Stavros Dimas, who needs 180 of Greece's ...