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Scotland Deputy First Minister Nicola Sturgeon warned voters they risked being governed by a Tory/Ukip coalition as Nigel Farage went on the campaign trail in the country.
Ms Sturgeon said: ''Nigel Farage's presence here today helpfully illustrates the choice people have to make next week - we can vote Yes and always get the governments we vote for as a country, or we can vote No and take the risk of another Tory government, or perhaps another Tory government with Ukip.
Ukip leader Nick Farage is the latest political leader to travel north to Scotland to campaign for a No vote in the referendum.
The eurosceptic said Scotland would not be truly independent by voting Yes because it would then look to join the EU.
As many as 100 Tory MPs could be preparing to defy the party leadership by making a personal pledge to vote for a British exit from the EU in an in/out referendum.
The Independent reports that the eurosceptics are prepared to promise to vote 'No' to EU membership regardless of what concessions David Cameron can win from Brussels.
The Prime Minister has pledged to renegotiate the terms of British membership and then give the British people an in/out referendum in 2017.
One backbencher, Rochester MP Mark Reckless, told the paper: “My election manifesto will confirm my view that we should leave the EU.”
It is thought many Tory MPs consider making such a pledge the only chance they have of holding on to their seats in the face of a surge in support for Ukip.
Ukip leader Nigel Farage said a by-election win for his party in Clacton would signal a "landslide in British politics".
The Conservative Party is set for a humiliating defeat to Douglas Carswell - who resigned from the Tories - according to an opinion poll in the Mail on Sunday, which gave Ukip a massive 44 point lead.
Mr Farage predicted a Ukip win would result in "more and more people coming over to us" and predicted the party could hold the balance of power after the next General Election.
He added: "If Douglas wins this by-election, then there will be more and more people coming over to us. We could end up holding the balance of power by next May."
Ukip look set to win the Clacton by-election convincingly, according to a new poll.
The by-election follows the decision by MP Douglas Carswell to defect from the Conservatives to Nigel Farage's party.
The Survation poll for the Mail on Sunday has Ukip on 64%, way ahead of the Tories on 20%, with Labour on 13% and the Lib Dems on just 2%.
Mr Carswell's personal appeal has helped the Ukip cause, with one in three respondents (34%) saying they would vote Ukip because they like him.
Roger Lord, who had been the Ukip general election candidate for Clacton until Douglas Carswell jumped ship yesterday, has called the Tory defector an "idiot".
"If somebody pushes me, I'm going to push back," he said. "Has he [Carswell] got a membership card? I'm not sure he's officially a member yet."
Mr Lord told ITV News Political Correspondent Libby Wiener that Mr Carswell "could have said sorry, but he hasn't got the guts to do it".
Douglas Carswell has denied suggestions he stabbed David Cameron in the back by defecting to Ukip.
He told ITV News' Libby Wiener he had nothing against "nice guy" David Cameron, but had to leave the Conservatives because the Prime Minister was "not serious about change".
He questioned what the difference would be if Ed Miliband's "gang replaced the current gang" in Number 10.
George Osborne has labelled the defection of Douglas Carswell to Ukip as "regrettable and counter-productive".
Speaking in Brighton today, the Chancellor said that the best way to secure a referendum on Britain's membership of the European Union was to have a Conservative government after the next election.
"That's the choice people are going to face, whether it's at the by-election in Clacton or at the general election next year," Mr Osborne said.
Nigel Farage, the Ukip leader, and the party's new candidate for Clacton have been campaigning on the streets of the seaside town this morning.
Douglas Carswell will contest the seat for the eurosceptic party after defecting from the Conservatives yesterday, triggering a by-election for the constituency.
Nigel Farage has reiterated more Conservative and Labour MPs are set to defect to Ukip following Douglas Carswell shock move from the Tories.
While on the campaign trail with Mr Carswell in Clacton this morning, Mr Farage said he expected more to jump ship if the Tory defector wins the by-election.
Mr Farage said, "Let's see what happens in this by-election, but if Douglas wins this by-election there'll be others - not just in the Conservatives but on the Labour backbenches too".