By John Stonestreet ATHENS (Reuters) - According to most of the two dozen-plus opinion polls published in Greece this month, Sunday's national election contest between Alexis Tsipras' leftist Syriza and Vangelis Meimarakis' conservative New Democracy will go down to the wire. In Britain, polls called the result of May's national election badly wrong. "I would not be surprised if the Miliband/Cameron effect replicates itself in Greece and the conservatives do a bit better than expected," said veteran independent political analyst Theodore Couloumbis.