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LIVERPOOL, ENGLAND - MARCH 14: Liberal Democrat Treasury Secretary Danny Alexander holds up the Lib Dems 'budget box' as he delivers his keynote speech to delegates during the party's spring conference at the ACC on March 14, 2015 in Liverpool, England. This is the last party conference for activists of the Liberal Democrats in the lead up to the May 7th general election. (Photo by Christopher Furlong/Getty Images)

LIVERPOOL, ENGLAND - MARCH 14:  Liberal Democrat Treasury Secretary Danny Alexander holds up the Lib Dems 'budget box' as he delivers his  keynote speech to delegates during the party's spring conference at the ACC on March 14, 2015 in Liverpool, England.  This is the last party conference for activists of the Liberal Democrats in the lead up to the May 7th general election.  (Photo by Christopher Furlong/Getty Images)