NEW : Election officials estimate turnout at 46 % . Basescu declares victory as exit polls indicate low turnout . Comment: The embattled Romanian president had urged supporters to skip Sunday 's vote .
NEW : Election officials estimate turnout at 46 % . Basescu declares victory as exit polls indicate low turnout . Prime minister says Basescu should consider stepping down despite result . The embattled Romanian president had urged supporters to skip Sunday 's vote .