Rather than being hostage to convention, Labour is focusing its campaign around policy rather than personality. It is painting itself as the party with the leader willing to take the hard but necessary decisions - be it a capital gains tax or compulsory savings for retirement.
It will portray Key as a lacklustre prime minister who always takes the soft options to maintain his popularity.
Goff will be used to front the issues on which Labour hopes to gain traction. Labour will accordingly launch its campaign today with the release of its savings policy. Goff will feature prominently in the presentation of that policy - just as he fronts some of Labour's television advertisements, notably one that has him railing against asset sales.
The concentration on policy as a means to enhance Goff's appeal to voters is a big gamble, however. Election campaigns can be devoid of serious debate about policy. The trivial can dominate.
That is one reason campaigns have become so presidential, with huge focus on the leaders. The leader has to embody what his or her party stands for and project that message during the campaign no matter the distractions.
That task reaches its climax in the televised leaders' debates.
Goff will go head-to-head with Key three times. The first debate next Monday offers him a golden opportunity to defy the public's typecasting of him. Moreover, the debate comes as some of the gloss has been removed from Key's prime ministership and Labour finally has some substantial ammunition to fire back at National on the question of economic management.
However, Goff's failure to front a campaign launch gives Key a free hit. The Prime Minister can question why the public should have any confidence in Goff's ability to do his job when his own party lacks confidence in him.
Election campaigns are an audition for the job of prime minister. That is why parties showcase their leader's strengths in front of an audience of clapping and cheering supporters. Such rallies demonstrate the party's faith in its leader. It is an opportunity to make the leader look like a winner.
Labour has not ruled out some kind of ra-ra rally later in the campaign. However, by trying to push the issue of leadership into the background before the campaign has barely begun, it is effectively hoisting the white flag on a crucial factor shaping voter choice.