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Page last updated at 07:28 GMT, Tuesday, 2 March 2010

Ashcroft money 'can make difference'

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Conservative donor and deputy chairman Lord Ashcroft has admitted he does not pay UK tax on earnings outside Britain. The 63-year-old, who is estimated to be worth £1.1bn by the Sunday Times Rich List, is one of the biggest ever donors to a political party and is at the centre of the Conservatives' election campaign. President of the polling organisation YouGov Peter Kellner discusses what difference Lord Ashcroft's money makes in the marginal seats.

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