Before David Cameron took over the leadership of the Conservative Party, he frequently pondered whether he might be able to engineer what he called a "Clause IV moment". The special conference to change the party's constitution that Tony Blair held soon after becoming Labour's leader was seen as a defining act that signalled to the electorate the birth of New Labour. Mr Cameron concluded that, sadly, there could be no equivalent for the Tories. Unlike Labour, they did not have an obsolete ideology to junk. Now it's beginning to look as if he may have stumbled on a Clause IV moment of his own after all.
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