"I will campaign wholeheartedly to achieve that result," Sturgeon will say.
The former party leader says a Leave vote would strengthen Britain's hand.
The charismatic Conservative is using the Brexit debate to further his chances.
The nation's biggest trade union warns of corporations being handed too much power.
Will the U.K. pull out at the crucial moment?
The EC president said Britain's new "emergency brake" would address the consequences of its own actions.
The EU reportedly plans to offer the U.K. emergency powers to freeze benefits for some EU workers.
British chancellor George Osborne has stressed the finality of the upcoming referendum vote.
The Tories have beaten projections in the election.
Vote on EU membership would create "most intense period of business anxiety" since WW2, Blair said.
Bubbling under the UK's general election campaign is a promised referendum on EU membership. Is Britain heading for the way out?
Britain's continued membership of the European Union hangs on the outcome of the election on May 7.
The Front National leader made the pledge during an interview with a Greek TV channel.
Alex Salmond, out-going First Minister of Scotland and figurehead of the independence movement, plots his next moves against the British state
Labour's Ed Miliband accused Cameron of putting millions of jobs at risk, as both men addressed business leaders in London
British Prime Minister David Cameron said his plan to try to reshape ties with the European Union would be the last attempt at renegotiation