It's easy to be a conviction politician. Real bravery consists of changing tack according to the evidence For months all the US presidential hopefuls have been accusing their rivals of flip-flopping. Politicians want to be like Margaret Thatcher, whose insistence that "the lady's not for turning" was a turning point in her popularity. Where are the conviction politicians of today, people ask. I'll tell you: in Zimbabwe, in Tehran, and in the White House. It was Walter, in The Big Lebowski, who...
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