GLASGOW, SCOTLAND - APRIL 27: Former Liberal Democrat leader Charles Kennedy campaigns with Business Minister Jo Swinson in East Dunbartonshire as the Lib Dem campaign gears up for the final phase of the general election on April 27, 2015 in Glasgow, Scotland. As the campaign enters the final ten days the countrys political parties are stepping up the campaign to appeal for votes from the undecided electorate. (Photo by Jeff J Mitchell/Getty Images)

GLASGOW, SCOTLAND - APRIL 27:  Former Liberal Democrat leader Charles Kennedy campaigns with Business Minister Jo Swinson in East Dunbartonshire as the Lib Dem campaign gears up for the final phase of the general election on April 27, 2015 in Glasgow, Scotland. As the campaign enters the final ten days the countrys political parties are stepping up the campaign to appeal for votes from the undecided electorate.  (Photo by Jeff J Mitchell/Getty Images)