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The leaders of 7 political parties are gearing up for a live, two-hour televised general election debate. The contest, announced after weeks of wrangling, will be the only time Conservative PM David Cameron and Labours Ed Miliband will face one another in a debate before polling day. The Lib Dems, SNP, UKIP, Plaid Cymru and the Greens will also take part.Ross Hawkins reports.\r
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