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First Minister of Scotland and leader of the Scottish National Party (SNP) Nicola Sturgeon (R) campaigns with local SNP candidate Michelle Thomson in South Queensferry on the outskirts of Edinburgh on April 28, 2015. Britain goes to the polls on May 7 to elect a new parliament. AFP PHOTO / ANDY BUCHANAN (Photo credit should read Andy Buchanan/AFP/Getty Images)

First Minister of Scotland and leader of the Scottish National Party (SNP) Nicola Sturgeon (R) campaigns with local SNP candidate Michelle Thomson in South Queensferry on the outskirts of Edinburgh on April 28, 2015. Britain goes to the polls on May 7 to elect a new parliament. 
AFP PHOTO / ANDY BUCHANAN        (Photo credit should read Andy Buchanan/AFP/Getty Images)