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Two Yes campaign posters are held up at top left, beside a group of No campaign supporters holding up posters as former British Prime Minister and No campaigner for the Scottish independence referendum Gordon Brown, right, briefly speaks to them as he leaves after delivering a speech at a No campaign event in Glasgow, Scotland, Wednesday, Sept. 17, 2014. (AP Photo/Matt Dunham) ( Britain Scotland )

Members of the Yes campaign have left messages in chalk on the pavements and buildings in Edinburgh, Scotland, Wednesday, Sept. 17, 2014. The two sides in Scotland's independence debate are scrambling to convert undecided voters, with just one day to go until a referendum on separation. (AP Photo/Scott Heppell) ( Britain Scotland )

Former Labour Prime Minister Gordon Brown makes his case for a No vote to a rally on September 17, 2014 in Glasgow, Scotland. The referendum debate has entered its final day of campaigning as the Scottish people prepare to go to the polls tomorrow to decide whether or not Scotland should have independence and break away from the United Kingdom. (Photo by Jeff J Mitchell/Getty Images) ( 455580004 )

A pro-independence supporter rides on a road in Kilmarnock, south-west of Glasgow in Scotland on September 17, 2014, ahead of the referendum on Scotland's independence. Campaigners for and against Scottish independence scrambled for votes on Wednesday on the eve of a knife-edge referendum that will either see Scotland break away from the United Kingdom or gain sweeping new powers with greater autonomy. AFP PHOTO / ANDY Buchanan/AFP/Getty Images ( 533493975 )

Yes activists gather in George Square on September 17, 2014 in Glasgow,Scotland.The referendum debate has entered its final day of campaigning as the Scottish people prepare to go to the polls tomorrow to decide whether or not Scotland should have independence and break away from the United Kingdom. (Photo by Jeff J Mitchell/Getty Images) ( 455587698 )

A piper plays following a speech by former Labour Prime Minister Gordon Brown who made the case for a No vote to a rally on September 17, 2014 in Glasgow, Scotland.The referendum debate has entered its final day of campaigning as the Scottish people prepare to go to the polls tomorrow to decide whether or not Scotland should have independence and break away from the United Kingdom. (Photo by Jeff J Mitchell/Getty Images) ( 455580330 )

People gather for a pro-independence rally in Glasgow's George Square, in Scotland, on September 17, 2014, ahead of the referendum on Scotland's independence. Spanish Prime Minister Mariano Rajoy on Wednesday branded moves for independence such as those in Scotland and Spain's Catalonia region a "torpedo" to European integration. AFP PHOTO / LEON NEAL/AFP/Getty Images ( 533493674 )

A dog wearing Yes badges is seen as supporters gather on Buchanan Street during the final day of campaigning for the scottish referendum ahead of tomorrows historic vote on September 17, 2014 in Glasgow, Scotland. (Photo by Mark Runnacles/Getty Images) ( 455581300 )

A young man palys the pipes as Yes activists gather in George Square on September 17, 2014 in Glasgow, Scotland.The referendum debate has entered its final day of campaigning as the Scottish people prepare to go to the polls tomorrow to decide whether or not Scotland should have independence and break away from the United Kingdom. (Photo by Jeff J Mitchell/Getty Images) ( 455584952 )

A young women joins Yes activists as they gather in George Square on September 17, 2014 in Glasgow,Scotland. (Photo by Jeff J Mitchell/Getty Images) ( 455586624 )

Yes activists gather in George Square on September 17, 2014 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images) ( 455587328 )

Former British Prime Minister and No campaigner for the Scottish independence referendum Gordon Brown, center, gestures at the end of his speech in Glasgow, Scotland, Wednesday, Sept. 17, 2014. Will the ayes have it, or will Scotland say no thanks? No one is certain. Excitement and anxiety mounted across the country Wednesday, the final day of campaigning before Thursday's referendum on independence. With opinion polls suggesting the result is too close to call and turnout expected to reach record levels, supporters of separation feel they are within touching distance of victory ó but wonder whether their surge in the polls will be enough. (AP Photo/Matt Dunham) ( Britain Scotland )

An anti-independence "Better Together" campaign canvasser posts "No" leaflets in Edinburgh, Scotland, on September 17, 2014, on the eve of Scotland's independence referendum. Campaigners for and against Scottish independence scrambled for votes on Wednesday on the eve of a knife-edge referendum that will either see Scotland break away from the United Kingdom or gain sweeping new powers with greater autonomy. AFP PHOTO / BEN STANSALL/AFP/Getty Images ( 533490310 )

Yes activists gather in George Square on September 17, 2014 in Glasgow,Scotland. (Photo by Jeff J Mitchell/Getty Images) ( 455588074 )

A person walks by a message left by a member of the Yes campaign written on a pavement, in Edinburgh, Scotland, Wednesday, Sept. 17, 2014. The two sides in Scotland's independence debate are scrambling to convert undecided voters, with just one day to go until a referendum on separation. (AP Photo/Scott Heppell) ( APTOPIX Britain Scotland )

Members of the Yes campaign leave messages in chalk on the pavements and buildings in Edinburgh, Scotland, Wednesday, Sept. 17, 2014. The two sides in Scotland's independence debate are scrambling to convert undecided voters, with just one day to go until a referendum on separation. (AP Photo/Scott Heppell) ( Britain Scotland )

Pro-independence campaigners place a huge "Yes" sign underneath Salisbury Crags in Edinburgh on September 17, 2014, on the eve of Scotland's independence referendum. AFP PHOTO/LESLEY MARTIN/AFP/Getty Images ( 533492222 )

Pro-independence supporters wave Scottish flags during a rally in central Glasgow, Scotland, on September 17, 2014, on the eve of Scotland's independence referendum. AFP PHOTO / ANDY Buchanan/AFP/Getty Images ( 533489939 )

Former British Prime Minister Gordon Brown addresses a rally in Glasgow, Scotland, on September 17, 2014, ahead of the referendum on Scotland's independence. AFP PHOTO / LEON NEAL/AFP/Getty Images ( 533490280 )

Workers prepare the inside of Highland Hall, the venue for the Edinburgh vote count and referendum declaration in Edinburgh, Scotland, on September 17, 2014, ahead of the referendum on Scotland's independence. AFP PHOTO / BEN STANSALL/AFP/Getty Images ( 533492704 )

People take leaflets from the bonnet of a car decorated in the colors of Catalonia in Glasgow's George Square, on September 17, 2014, during a pro-independence rally, ahead of the referendum on Scotland's independence. Spanish Prime Minister Mariano Rajoy on Wednesday branded moves for independence such as those in Scotland and Spain's Catalonia region a "torpedo" to European integration. AFP PHOTO / LEON NEAL/AFP/Getty Images ( 533493456 )

People gather for a pro-independence rally in Glasgow's George Square, in Scotland, on September 17, 2014, ahead of the referendum on Scotland's independence. Spanish Prime Minister Mariano Rajoy on Wednesday branded moves for independence such as those in Scotland and Spain's Catalonia region a "torpedo" to European integration. AFP PHOTO / LEON NEAL/AFP/Getty Images ( 533493653 )

A scottish flag is waved in front of an anti-independence activist during a pro-independence rally in Glasgow's George Square, in Scotland, on September 17, 2014, ahead of the referendum on Scotland's independence. Campaigners for and against Scottish independence scrambled for votes on Wednesday on the eve of a knife-edge referendum that will either see Scotland break away from the United Kingdom or gain sweeping new powers with greater autonomy. AFP PHOTO / LEON NEAL/AFP/Getty Images ( 533494237 )

An ice-cream van decorated with pro-independence literature is pictured in Glasgow in Scotland, on September 17, 2014, ahead of the referendum on Scotland's independence. Spanish Prime Minister Mariano Rajoy on Wednesday branded moves for independence such as those in Scotland and Spain's Catalonia region a "torpedo" to European integration. AFP PHOTO / LEON NEAL/AFP/Getty Images ( 533493723 )

People gather for a pro-independence rally in Glasgow's George Square, in Scotland, on September 17, 2014, ahead of the referendum on Scotland's independence. AFP PHOTO / LEON NEAL/AFP/Getty Images ( 533493896 )

No campaigner Judy Shaw Stewart from Doune, Scotland stands near her tent near the A84 highway to protect NO Thanks signs from being vandalized, as the campaign ahead of the Scottish independence referendum enters its final days Monday Sept. 15, 2014. (AP Photo/Andrew Milligan/PA) ( Britain Scotland )

Duncan Thomson, Brian McCutcheon, John Patterson and Arthur Murdoch,from King of Scots Robert the Bruce Society, hold the Scottish flags as they prepare to vote in the Scottish independence referendum on September 14, 2014 in Loch Lomond. The latest polls in Scotland's independence referendum put the No campaign back in the lead, the first time they have gained ground on the Yes campaign since the start of August. (Photo by Jeff J Mitchell/Getty Images) ( 455471162 )

A YES campaign Statue of Liberty on display in Niddrie a suburb of Edinburgh, Scotland, Tuesday, Sept. 16, 2014. The two sides in Scotland's independence debate scrambled Tuesday to convert undecided voters, with just two days to go until a referendum on separation. The pitch of the debate has grown increasingly urgent. Anti-independence campaigners argue that separation could send the economy into a tailspin, while the Yes side accuses its foes of scaremongering. (AP Photo/David Cheskin) ( Britain Scotland )

Yes campaigners stand near No supporters at Dumbarton Town Hall as former Prime Minister Gordon Brown leaves after attending a rally on September 16, 2014 in Glasgow, Scotland. Yes and No supporters are campaigning in the last two days of the referendum to decide if Scotland will become an indpendent country. (Photo by Peter Macdiarmid/Getty Images) ( 455527786 )

A Saltire with Yes printed on it flies in Dunbar, Scotland, Tuesday, Sept. 16, 2014. The two sides in Scotland's independence debate are scrambling to convert undecided voters, with just two days to go until a referendum on separation. Anti-independence campaigners are pushing home their message that a "No" vote doesn't mean the status quo. The three main British political parties are promising Scotland greater powers, including tax-raising authority, if it remains part of the United Kingdom. The Yes campaign says the promises are vague and reveal the No side's desperation, with polls suggesting the outcome will be close. Scottish Deputy First Minister Nicola Sturgeon said "the only way to guarantee the real powers we need in Scotland is to vote Yes." (AP Photo/Scott Heppell) ( APTOPIX Britain Scotland )

Prime Minister David Cameron addresses members of the No campaign on September 15, 2014 in Aberdeen,Scotland. The latest polls in Scotland's independence referendum put the No campaign back in the lead, the first time they have gained ground on the Yes campaign since the start of August. (Photo by Peter Macdiarmid/Getty Images) ( 455478062 )

Deputy First Minister Nicola Sturgeon and Cabinet Secretary for Finance John Swinney, look on as 19 year old apprentice fabricator Craig McKee angle grinds a yes sign during their visit to Steel Engineering on September 16, 2014 in Renfrew, Scotland. With just two days of campaigning left before polling stations open and voters across the country will hold Scotlands future in their hands. (Photo by Jeff J Mitchell/Getty Images) ( 455521784 )

No supporters gather at an event where Deputy First Minister Nicola Sturgeon, was meeting with care workers at Renfrew Town hall on September 16, 2014 in Renfrew, Scotland. With just two days of campaigning left before polling stations open and voters across the country will hold Scotlands future in their hands. (Photo by Jeff J Mitchell/Getty Images) ( 455524630 )

Pro-independence campaigner Ed Hastings poses for pictures wearing traditional Highland dress in Edinburgh, Scotland, on September 16, 2014, ahead of the referendum on Scotland's independence. The leaders of the three main British parties on Tuesday issued a joint pledge to give the Scottish parliament more powers if voters reject independence, in a final drive to stop the United Kingdom splitting. AFP PHOTO / BEN STANSALL/AFP/Getty Images ( 533460624 )

Former Prime Minister Gordon Brown speaks at Dumbarton Town hall to No campaigners on September 16, 2014 in Glasgow, Scotland. Yes and No supporters are campaigning in the last two days of the referendum to decide if Scotland will become an indpendent country. (Photo by Peter Macdiarmid/Getty Images) ( 455527090 )

Volunteers from the Yes campaign prepare to go and canvass in the Pilton area of Edinburgh on September 16, 2014 in Edinburgh, Scotland. Yes and No supporters are campaigning in the last two days of the referendum to decide if Scotland will become an independent country. (Photo by Matt Cardy/Getty Images) ( 455527854 )

Yes and No campaign placards adorn a lamp post in sight of the Campsie Fells on September 16, 2014 in Glasgow, Scotland. Yes and No supporters are campaigning in the last two days of the referendum to decide if Scotland will become an independent country. (Photo by Peter Macdiarmid/Getty Images) ( 455528530 )

Yes campaigners take part in a demonstration in Buchanan Street on September 16, 2014 in Renfrew, Scotland. With just two days of campaigning left before polling stations open and voters across the country will hold Scotlands future in their hands. . (Photo by Jeff J Mitchell/Getty Images) ( 455533306 )

Yes campaigners take part in a demonstration in Buchanan Street on September 16, 2014 in Renfrew, Scotland. With just two days of campaigning left before polling stations open and voters across the country will hold Scotlands future in their hands. . (Photo by Jeff J Mitchell/Getty Images) ( 455533312 )

Yes campaigners take part in a demonstration in Buchanan Street on September 16, 2014 in Renfrew, Scotland. With just two days of campaigning left before polling stations open and voters across the country will hold Scotlands future in their hands. . (Photo by Jeff J Mitchell/Getty Images) ( 455533314 )

Yes campaigners take part in a demonstration in Buchanan Street on September 16, 2014 in Renfrew, Scotland. With just two days of campaigning left before polling stations open and voters across the country will hold Scotlands future in their hands. . (Photo by Jeff J Mitchell/Getty Images) ( 455533324 )

A Yes campaigner takes part in a demonstration in Buchanan Street on September 16, 2014 in Renfrew, Scotland. With just two days of campaigning left before polling stations open and voters across the country will hold Scotlands future in their hands. . (Photo by Jeff J Mitchell/Getty Images) ( 455533328 )

A 'No' campaign supporter attempts to disrupt a 'Yes' pro-independence campaign in Buchanan Street on September 16, 2014 in Renfrew, Scotland. With just two days of campaigning left before polling stations open and voters across the country will hold Scotlands future in their hands. (Photo by Jeff J Mitchell/Getty Images) ( 455533364 )

Leader of the Labour Party Ed Miliband visits St James Shopping Centre in central Edinburgh on September 16, 2014 in Edinburgh, Scotland. Yes and No supporters are campaigning in the last two days of the referendum to decide if Scotland will become an independent country. (Photo by Matt Cardy/Getty Images) ( 455535022 )

A supporter holds a placard at a pro-union rally, at Trafalgar square in central London, Monday, Sept. 15, 2014. Hundreds of people, supporters of the 'Lets Stay Together' campaign, gathered ahead of a referendum on whether Scotland should be an independent country that will take place in Scotland on Thursday, Sept. 18, 2014. (AP Photo/Lefteris Pitarakis) ( Britain Scotland )

A visitor looks at "The Auld Acquaintance" cairn, which is being built as a monument supporting the union of Scotland and the U.K., as a Scottish Saltire flag, second right, flies alongside the other flags of the countries in the U.K. on the England Scotland border near Gretna, Scotland, Monday, Sept. 15, 2014. The stone circle is being built as a mass participation project as a monument to togetherness, open to anyone who wishes to place a stone there, decorated or otherwise. If Scottish-based voters approve separation from the U.K. on Thursday, officials from Scotland and Britain will have to sort out assets and debt, questions over continued membership in the United Nations and European Union, and whether to retain a common currency. (AP Photo/Matt Dunham) ( Britain Scotland )

Members of the public walk past a Yes sign which has been graffitied on a wall in Edinburgh, Scotland, Tuesday, Sept. 16, 2014. The two sides in Scotland's independence debate are scrambling to convert undecided voters, with just two days to go until a referendum on separation. Anti-independence campaigners are pushing home their message that a "No" vote doesn't mean the status quo. The three main British political parties are promising Scotland greater powers, including tax-raising authority, if it remains part of the United Kingdom. The Yes campaign says the promises are vague and reveal the No side's desperation, with polls suggesting the outcome will be close. Scottish Deputy First Minister Nicola Sturgeon said "the only way to guarantee the real powers we need in Scotland is to vote Yes." (AP Photo/Scott Heppell) ( Britain Scotland )

Adjoining houses display No and Yes signs in their windows in Dunbar, Scotland, Tuesday, Sept. 16, 2014. The two sides in Scotland's independence debate are scrambling to convert undecided voters, with just two days to go until a referendum on separation. Anti-independence campaigners are pushing home their message that a "No" vote doesn't mean the status quo. The three main British political parties are promising Scotland greater powers, including tax-raising authority, if it remains part of the United Kingdom. The Yes campaign says the promises are vague and reveal the No side's desperation, with polls suggesting the outcome will be close. Scottish Deputy First Minister Nicola Sturgeon said "the only way to guarantee the real powers we need in Scotland is to vote Yes." (AP Photo/Scott Heppell) ( Britain Scotland )

Yes activist Darren Brander holds a Saltire flag outside his home in Glasgow, Scotland, as the campaign ahead of the Scottish independence referendum enters its final days Monday Sept. 15, 2014. (AP Photo/Danny Lawson/PA) ( Britain Scotland )

Better Together supporter Walter Barclay stands in his back yard in Glasgow, Scotland, as the campaign ahead of the Scottish independence referendum enters its final days Monday Sept. 15, 2014. (AP Photo/Stefan Rousseau/PA) ( Britain Scotland )

A Yes sign is displayed on a fisherman's shack in St Abbs, Scotland, Tuesday, Sept. 16, 2014. The two sides in Scotland's independence debate are scrambling to convert undecided voters, with just two days to go until a referendum on separation. Anti-independence campaigners are pushing home their message that a "No" vote doesn't mean the status quo. The three main British political parties are promising Scotland greater powers, including tax-raising authority, if it remains part of the United Kingdom. The Yes campaign says the promises are vague and reveal the No side's desperation, with polls suggesting the outcome will be close. Scottish Deputy First Minister Nicola Sturgeon said "the only way to guarantee the real powers we need in Scotland is to vote Yes." (AP Photo/Scott Heppell) ( Britain Scotland )

A pro-independence campaigner poses for pictures in Aberdeen in Scotland, on September 15, 2014, ahead of the referendum on Scotland's independence. British Prime Minister David Cameron on Monday was to plead with Scots to vote against independence in a referendum as Scotland enters the most decisive week in its modern history. AFP PHOTO/BEN STANSALL/AFP/Getty Images ( 533432560 )

Customers drink in a pro-independence bar re-named as the 'Yes Bar' in Glasgow, Scotland, on September 15, 2014, ahead of the referendum on Scotland's independence. British Prime Minister David Cameron on Monday was to plead with Scots to vote against independence in a referendum as Scotland enters the most decisive week in its modern history. AFP PHOTO / ANDY Buchanan/AFP/Getty Images ( 533433669 )

Jockey Carol Batley, representing the "No" vote, (R) and jockey Rachael Grant, representing the "Yes" vote, prepare to take part in a 'Referendum Race' sponsored by the bookmakers Ladbrokes at Musselburgh racecourse in Edinburgh, Scotland, on September 15, 2014, ahead of the referendum on Scotland's independence. British Prime Minister David Cameron on Monday was to plead with Scots to vote against independence in a referendum as Scotland enters the most decisive week in its modern history. AFP PHOTO / LEON NEAL/AFP/Getty Images ( 533434469 )

Pro-union supporters, opposing Scottish independence from the United Kingdom pose for a photograph during a rally in Trafalgar Square in London on September 15, 2014, ahead of the Scottish independence referendum. Thousands gathered in London to urge Scottish voters to reject independence and stay in the United Kingdom in a referendum in three days time. Demonstrators in the rally in central Trafalgar Square waved union jack flags and held up signs reading "let's stay together" and "Scotland we love you, don't go."Trafalgar Square, demo for the NO campaigners. AFP PHOTO/CYRIL VILLEMAIN/AFP/Getty Images ( 533438903 )

Pro-union supporters, opposing Scottish independence from the United Kingdom wave flags during a rally in Trafalgar Square in London on September 15, 2014, ahead of the Scottish independence referendum. Thousands gathered in London to urge Scottish voters to reject independence and stay in the United Kingdom in a referendum in three days time. Demonstrators in the rally in central Trafalgar Square waved union jack flags and held up signs reading "let's stay together" and "Scotland we love you, don't go."Trafalgar Square, demo for the NO campaigners. AFP PHOTO/CYRIL VILLEMAIN/AFP/Getty Images ( 533438963 )

The word 'Scotland' is engraved on a stone monument on the border between England and Scotland, near the town of Berwick-Upon-Tweed, on September 16, 2014, ahead of the referendum on Scotland's independence. The leaders of the three main British parties on Tuesday issued a joint pledge to give the Scottish parliament more powers if voters reject independence, in a final drive to stop the United Kingdom splitting. AFP PHOTO / LESLEY MARTIN/AFP/Getty Images ( 533456898 )

A man holds a 'No' poster inside the pro-union pub "The District Bar" in Glasgow, Scotland, on September 15, 2014. The leaders of the three main British parties on Tuesday issued a joint pledge to give the Scottish parliament more powers if voters reject independence, in a final drive to stop the United Kingdom splitting. AFP PHOTO / LEON NEAL/AFP/Getty Images ( 533453513 )

British Chief Secretary to the Treasury Danny Alexander (2nd L) and Former Liberal Democrat party leader Charles Kennedy (3rd L) speak to the media at a "Better Together" campaign poster launch in Glasgow, Scotland on September 16, 2014. AFP PHOTO/LEON NEAL/AFP/Getty Images ( 533455929 )

A pro-independence campaigner poses for pictures as she campaigns in Edinburgh, Scotland, on September 15, 2014, ahead of the referendum on Scotland's independence. The leaders of the three main British parties on Tuesday issued a joint pledge to give the Scottish parliament more powers if voters reject independence, in a final drive to stop the United Kingdom splitting. AFP PHOTO / LESLEY MARTIN/AFP/Getty Images ( 533456939 )

Campaigners wait for the arrival of Deputy First Minister Nicola Sturgeon ahead of a carer's meeting in Renfrew, Scotland on September 16, 2014, ahead of the referendum on Scotland's independence. The leaders of the three main British parties on Tuesday issued a joint pledge to give the Scottish parliament more powers if voters reject independence, in a final drive to stop the United Kingdom splitting. AFP PHOTO / LEON NEAL/AFP/Getty Images ( 533458645 )

A campaigner waits for the arrival of Deputy First Minister Nicola Sturgeon ahead of a carer's meeting in Renfrew, Scotland on September 16, 2014, ahead of the referendum on Scotland's independence. The leaders of the three main British parties on Tuesday issued a joint pledge to give the Scottish parliament more powers if voters reject independence, in a final drive to stop the United Kingdom splitting. AFP PHOTO / LEON NEAL/AFP/Getty Images ( 533458672 )

Scotland's Saltire flag (L) and Britain's Union flag are pictured in London, on September 16, 2014, ahead of the referendum on Scotland's independence. The leaders of the three main British parties on Tuesday issued a joint pledge to give the Scottish parliament more powers if voters reject independence, in a final drive to stop the United Kingdom splitting. AFP PHOTO / CYRIL VILLEMAIN/AFP/Getty Images ( 533459586 )

A pro-independence 'opinion board' is pictured in Edinburgh, Scotland, on September 16, 2014, ahead of the referendum on Scotland's independence. The leaders of the three main British parties on Tuesday issued a joint pledge to give the Scottish parliament more powers if voters reject independence, in a final drive to stop the United Kingdom splitting. AFP PHOTO / BEN STANSALL/AFP/Getty Images ( 533460663 )

This picture shows a Pro-Union window display in a shop in Coldstream, some 77 Kms south east of Edinburgh, on September 16, 2014, ahead of the referendum on Scottish independence. The leaders of Britain's three main parties issued a joint pledge to give the Scottish parliament more powers if voters reject independence, in a final drive to stop the United Kingdom from splitting. AFP PHOTO/LESLEY MARTIN/AFP/Getty Images ( 533462226 )

Pro-independence cyclists display "Yes" placards in favor of Scottish independence on their bikes as they ride through Glasgow on September 16, 2014, ahead of the referendum on Scottish independence. Scots head to the polls on September 18, 2014 for an independence referendum that could end its three centuries old union with England and create Europe's newest country since the collapse of Yugoslavia. AFP PHOTO/LEON NEAL/AFP/Getty Images ( 533463174 )

Scottish Conservative Leader, Ruth Davidson (R) canvasses for a "No" Vote ahead of the referendum on Scottish independence in Coldstream, some 77 Kms south east of Edinburgh, on September 16, 2014. The leaders of Britain's three main parties issued a joint pledge to give the Scottish parliament more powers if voters reject independence, in a final drive to stop the United Kingdom from splitting. AFP PHOTO/LESLEY MARTIN/AFP/Getty Images ( 533462476 )

People listens in as pro-independence and anti-independence supporters debate the issues in the streets of central Glasgow on September 16, 2014, ahead of the referendum on Scottish independence. Scots head to the polls on September 18, 2014 for an independence referendum that could end its three centuries old union with England and create Europe's newest country since the collapse of Yugoslavia. AFP PHOTO/LEON NEAL/AFP/Getty Images ( 533463260 )

A pro-independence campaigner hands out leaflets in central Glasgow on September 16, 2014, ahead of the referendum on Scottish independence. Scots head to the polls on September 18, 2014 for an independence referendum that could end its three centuries old union with England and create Europe's newest country since the collapse of Yugoslavia. AFP PHOTO/LEON NEAL/AFP/Getty Images ( 533463208 )

A man wears pro-independence stickers on his glasses in central Glasgow on September 16, 2014, ahead of the referendum on Scottish independence. Scots head to the polls on September 18, 2014 for an independence referendum that could end its three centuries old union with England and create Europe's newest country since the collapse of Yugoslavia. AFP PHOTO/LEON NEAL/AFP/Getty Images ( 533463299 )

Yes signs are seen in a shop window in Dunbar, Scotland, Tuesday, Sept. 16, 2014. The two sides in Scotland's independence debate are scrambling to convert undecided voters, with just two days to go until a referendum on separation. Anti-independence campaigners are pushing home their message that a "No" vote doesn't mean the status quo. The three main British political parties are promising Scotland greater powers, including tax-raising authority, if it remains part of the United Kingdom. The Yes campaign says the promises are vague and reveal the No side's desperation, with polls suggesting the outcome will be close. Scottish Deputy First Minister Nicola Sturgeon said "the only way to guarantee the real powers we need in Scotland is to vote Yes." (AP Photo/Scott Heppell) ( Britain Scotland )

Anti-independence "Better Together" campaigners hold placards outside New Victoria hospital in Glasgow on September 16, 2014, ahead of the referendum on Scottish independence. Scots head to the polls on September 18, 2014 for an independence referendum that could end its three centuries old union with England and create Europe's newest country since the collapse of Yugoslavia. AFP PHOTO/LEON NEAL/AFP/Getty Images ( 533463601 )

Scotland's Deputy First Minister Nicola Sturgeon eats a "Yes cupcake" during a visit to a carer's meeting in Renfrew in Scotland, on September 16, 2014, ahead of the referendum on Scotland's independence. The leaders of the three main British parties on Tuesday issued a joint pledge to give the Scottish parliament more powers if voters reject independence, in a final drive to stop the United Kingdom splitting. AFP PHOTO / LEON NEAL/AFP/Getty Images ( 533461292 )