We all know what would happen - the air would be thick with choruses of "secret agenda", "slippery John", "borrow for tax cuts" etc etc ad infinitum, ad nauseum.
And yet that is exactly what Labour plans to do - this from today's Herald:
Labour is designing a potentially large spending plan to stimulate the economy - but will not say before the election how much it might spend or how much it might add to Government debt.
The move is part of Labour's bid to seize the economic initiative in the election campaign with policies addressing the global financial crisis and its fallout.
But as Labour talks of a mini-Budget in December and the bringing forward of infrastructure spending if it wins the election, it is not telling voters the financial implications of its short-term measures.
And Helen Clark has the bare-faced cheek to tell us that "This is an election about trust"!