Barack Obama tonight urged Scottish voters not to break apart ‘one of the closest allies we’ll ever have’ by voting for independence on Thursday. The dramatic intervention, just three days before Scotland goes to the polls, will infuriate Alex Salmond - with the battle for independence set to be decided by the smallest of margins. Up to half a million voters remain undecided - with concerns over the future of Scotland’s place in major international organisations like the EU, Nato and the UN still hotly debated.