BUCHAREST (Reuters) - Romanians are losing patience with politicians who seem more interested in arguing with each other than addressing problems that beset the European Union's second poorest member. That may push voters in a parliamentary election that is only five months away towards populist parties or fringe members of mainstream parties who pursue more extreme policies, as it has in Greece or neighboring Hungary. Victor Ponta, Romania's third prime minister in five months, took power in May and is already under pressure over plagiarism charges. ...