And if you're a Labour voter seized with gloom – or a Tory gleaming with complacency – just remember that in 1906, six years after the last single-is… - Emily Thornberry

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And if you're a Labour voter seized with gloom – or a Tory gleaming with complacency – just remember that in 1906, six years after the last single-issue election, the Liberal opposition won a majority of 124, with the Tories losing 246 seats. Why? Because the Tories were totally divided over trade policy and because their "single issue" of the Boer war had turned into a disaster.
Will history repeat itself now as the Tories grapple with the reality of "getting Brexit done"? Well, history has a tendency to do that.