By Gideon Rachman
What should western politicians be most worried about: growth, inequality, the environment, education? To judge from today’s discourse, the answer seems to be none of the above. Instead, in the past month, both Barack Obama, US president, and David Cameron, UK prime minister, have made big speeches on immigration. At the weekend Swiss voters rejected a proposal virtually to end the flow of incomers to their country. But anti-immigration parties have made strong gains in a variety of other European nations, including Sweden and Italy, in the past year.
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