UK's breakout star not even a candidate
Nicola Sturgeon, head of the Scottish National Party, may hold the key to the next British government. CNN's Phil Black explains.
03:08 - Source: CNN
The Battle for Parliament 29 videos
Scotland's First Minister Nicola Sturgeon on April 7, 2015 in Livingston, Scotland.
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Caption:The Saltire, the flag of Scotland flies above the Union flag at the site of the Auld Acquaintance cairn which is being constructed at a site on the banks of the River Sark in Gretna in Scotland, which is thought to be the historic border between Scotland and England, taken on August 17, 2014. A month to the day until Scotland votes on whether to split from Britain, opinion polls Monday showed the pro-independence camp gaining ground as First Minister Alex Salmond insisted his side had a 'spring in their step'. But the polls still showed a strong lead for the 'No' camp ahead of the vote on September 18, suggesting voters are on course to reject independence. Debate in the campaign has so far focused on Scotland's economy, particularly on the currency post-independence. AFP PHOTO/ANDY BUCHANAN (Photo credit should read Andy Buchanan/AFP/Getty Images)
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Nicola Sturgeon waves as she gives her first key note speech as SNP party leader at the party's annual conference on November 15, 2014 in Perth, Scotland. Nicola Sturgeon formally took over the leadership of the SNP from Alex Salmond yesterday, during her speech she urged voters to leave Labour in next May's UK election
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Elizabeth Tower, commonly called Big Ben, is pictured on April 1, 2015 in London, United Kingdom. Parliament has been dissolved as campaigning gets under way by the political parties ahead of the forthcoming general election on May 7th.
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A voter enters a polling station located in the Old Post Office in the village of Brokenborough near Malmesbury on May 7, 2015 in Wiltshire, England
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Leader of the Labour party Ed Miliband addresses business leaders and members of the media at Bloomberg LP's European headquarters on March 30, 2015 in London, England. Mr Miliband spoke to members of the business community today warning of the dangers of an EU referendum, a conservative party pledge. British Prime Minister David Cameron will visit Queen Elizabeth II at Buckingham Palace today as Parliament dissolves and the parties begin their campaigns ahead of the May 7 general election.
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First Minister of Scotland and leader of the SNP Nicola Sturgeon (2L) poses with supporters during a UK general election campaign visit to the Cook School in Kilmarnock, Ayrshire, southwest Scotland on April 27, 2015. Britain goes to the polls on May 7 to elect a new parliamnt. SNP leader Nicola Sturgeon, whose party is expected to win most of Scotland's House of Commons seats amid surging support after last year's rejected independence referendum, wants to do a post-election deal with Labour. AFP PHOTO / ANDY BUCHANANAndy Buchanan/AFP/Getty Images
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Britain's Prime Minister and Conservative Party leader David Cameron and his wife Samantha arrive to vote at a polling station in Spelsbury, England, as they vote in the general election, Thursday, May 7.
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HENDON, ENGLAND - MAY 05: Prime Minister David Cameron speaks to staff at Utility Warehouse on May 5, 2015 in Hendon, England. Campaigning has intensified in the last few days before voters go to the polls in a general election on May 7, 2015. (Photo by Rob Stothard/Getty Images)
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Opposition Labour Party Leader Ed Miliband speaks at a campaign event in Kempston near Bedford on May 5, 2015. Britain's political leaders today began a final push for votes ahead of Thursday's knife-edge election, even as they prepared for the likelihood of protracted coalition talks once polls close. AFP PHOTO / ADRIAN DENNISADRIAN DENNIS/AFP/Getty Images
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LONDON, ENGLAND - MARCH 04: United Kingdom Independence Party leader Nigel Farage speaks during a conference in which the party's immigration policy was unveiled on March 4, 2015 in London, England. Farage stated that UKIP wants immigration to return to 'normal' levels with around 20,000 to 50,000 migrants issued with work permits.
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