For nearly three years now, Peter Dutton has deployed — with considerable success — one of the few orthodox political tactics which remains a good bet even in these strange and hectic times: Set expectations low and clear them with ease. When he started his new job as Liberal leader three years ago, Mr Dutton enjoyed the strategic advantage of being thought unelectable, laughable, and — in some quarters — actively stupid. It's an advantage he has put to profitable use, whatever you might personally make of the opposition leader's politics. But in recent times, as the Australian population and...