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GLASGOW, SCOTLAND - MAY 01: Scottish Independence protesters demonstrate in front of Labour supporters ahead of the arrival of Labour leader Ed Miliband for a campaign speech on May 1, 2015 in Glasgow, Scotland. Britain goes to the polls in a general election on May 7. (Photo by Carl Court/Getty Images)

GLASGOW, SCOTLAND - MAY 01:  Scottish Independence protesters demonstrate in front of Labour supporters ahead of the arrival of Labour leader Ed Miliband for a campaign speech on May 1, 2015 in Glasgow, Scotland. Britain goes to the polls in a general election on May 7.  (Photo by Carl Court/Getty Images)