Miliband, during the election campaign, tried to reassure middle-class voters that Labour utterly ruled out any SNP influence on policies like austerity or the Trident nuclear system. And while the Labour Party tailed the Tories on austerity, while they imitated Tory language on welfare, while they copied the UK Independence Party (UKIP) on immigration, the SNP defended a simple, civilized position: no austerity, stop demonizing people on welfare, and welcome immigrants.
In England, Labour aping the Right just leads to its base abstaining, as they have done in growing numbers since 2001. But in Scotland, working-class voters had a tried and tested reformist alternative, with an optimistic political identity linked to a profound socio-demographic shift, and were able to rally to it.