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LONDON - MARCH 05: Liberal Democrat MP for West Morland and Lonsdale, Tim Farron speaks to media on March 5, 2008 in London, England. A number of Liberal Democrat Leaders are preparing to defy the order to abstain in the vote on whether there should be a referendum on the Lisbon Treaty. (Photo by Daniel Berehulak/Getty Images)

LONDON - MARCH 05:  Liberal Democrat MP for West Morland and Lonsdale, Tim Farron speaks to media on March 5, 2008 in London, England. A number of Liberal Democrat Leaders are preparing to defy the order to abstain in the vote on whether there should be a referendum on the Lisbon Treaty.  (Photo by Daniel Berehulak/Getty Images)