This is from the rest of the article. It's in the public domain, so I guess it's not breaching copyright...
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Mr Duncan Smith’s motives may be dubious and his complaint off-target (the proposed disability cuts were less egregious than some others). But he has stumbled on something that matters. The budget was regressive, cutting welfare as it reduced income tax for the top 15% of earners and capital-gains taxes mostly paid by the asset-rich (see article). Ministers say that a forthcoming increase in the minimum wage compensates for the cuts. In fact it most benefits middling households (since its recipients often support a higher-earning partner) and is part of a wider post-election tilt towards the better off. According to one estimate, changes announced since the Conservatives won a majority last year will leave the average annual income of the top 30% of households £280 ($400) higher and that of the bottom 30% £565 lower. Meanwhile the jobs engine is slowing, wage growth is faltering and the wealthiest are roaring ahead. The fall in inequality over the previous parliament will probably be wiped out over the course of this one.
Blame politics. The Conservatives won the election partly by pledging a rush to budget surplus through welfare cuts so stringent that the Labour Party could not bring itself to match them. It also promised to ring-fence sensitive budgets like hospitals, schools and foreign aid, and committed to a “triple lock”, increasing the state pension by the rate of inflation, earnings growth or 2.5% a year, whichever is greatest. Such promises have left Mr Osborne with little option but to dip into the pockets of poorer, younger Britons who, conveniently, are less likely to vote. And with a divisive EU referendum looming in June, local Tory associations in revolt and a leadership election on the horizon, no minister wants to sting the plump, grey Conservative base. The Labour Party may have trooped into the left-wing wilderness under Jeremy Corbyn, but the centrist overtures with which the prime minister has recently wooed the opposition’s more moderate supporters have been confined to safe schemes like improving mental health and sprucing up sink estates.
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I agree with the article. Cameron and Osborne have made so many 'back of fag packet' promises to win votes that they've made a rod for their own back.