At first it looked analogous with winning the war in Iraq: secure the victory and then worry about what you do afterwards. But now the Conservatives are getting increasingly worried about possible collateral damage if Boris Johnson becomes the new mayor of London, as looks likely.
Asked if there were concerns that a poorly run London under a Tory mayor could rebound on Dave Cameron, a shadow cabinet minister is reported to have told the Financial Times: 'Absolutely ... we need very good people in place to help Boris.'
Some analysts think that the mayoral contest is a dress rehearsal for the general election campaign with calls for change from the Conservatives being contrasted with Labour charges of inexperience. Boris Johnson is being advised on his strategy by Australian election guru Lynton Crosby.