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5 live's round-up of day 11 of the General Election campaign, including a row over the UK's nuclear deterrent and a Conservative minister accusing Ed Miliband of being a "backstabber". Plus John Pienaar on the Lib Dems' battle bus with Nick Clegg, our reporters with the Tory, Labour and UKIP campaigns, and the Greens’ musical twist on the party political broadcast.