Man takes selfie with SNP leader Nicola Sturgeon
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Election 2015: Will the Scottish National Party shake up the election?

As polls suggest there may be a hung parliament after the general election of 7 May, attention is turning to the likely influence of the smaller political parties.

SNP leader Nicola Sturgeon is widely thought to have given an impressive performance in a TV election debate on Thursday night.

Scotland correspondent James Cook went out with her on the campaign trail to see what effect the SNP might have.

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