To break any Blairite veto and trounce Cameron, Gordon Brown should come to an understanding with the Liberal Democrats.

Gordon Brown is no doubt excessively cautious by nature, but for some years now he has behaved as if bound to his neighbour's most disastrous policies by an invisible chain. The optimistic may think that all this will change once Blair has gone and Brown is himself formally lodged in No 10.

The Blairite veto stems from Brown's fear that an embittered group of Blairistas could...