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GLASGOW, SCOTLAND - APRIL 01: Charles Kennedy Liberal Democrat MP, and Douglas Alexander Labour MP, attend the launch of the fairer votes campaign on April 1, 2011 in Glasgow, Scotland. Activists are campaigning for an alternative to replace the first past the post voting system with a referendum on May the 5th , the same day as the Scottish Election. (Photo by Jeff J Mitchell/Getty Images)

GLASGOW, SCOTLAND - APRIL 01:  Charles Kennedy Liberal Democrat MP, and Douglas Alexander Labour MP, attend the launch of the fairer votes campaign on April 1, 2011 in Glasgow, Scotland. Activists  are campaigning for an alternative to replace the first past the post voting system with a referendum on May the 5th , the same day as the Scottish Election. (Photo by Jeff J Mitchell/Getty Images)