(ROUGH CUT ONLY - NO REPORTER NARRATION)<br/> Russian Prime Minister Vladimir Putin casts his vote in parliamentary elections widely seen as a test of his ruling party, United Russia.<br/> Opinion polls show that United Russia is likely to win a majority, but less than the 315 seats it currently has at the 450-seat lower house of parliament.<br/> If Putin's party gets less than two-thirds of seats it will be stripped of its so called constitutional majority, which allows it to change the constitution and even approve the impeachment of the president.<br/> Opposition parties say the election is unfair because the authorities support United Russia with money and television air time.<br/> They also predicted vote-rigging, to boost support for Vladimir Putin's party.
