If only, like former Green MP Keith Locke, she'd promised to do a Lady Godiva instead. During the 2005 campaign, Mr Locke had rashly threatened to "run down the main street of Epsom naked if Rodney Hide wins Epsom". Mr Hide scored a surprise 3244 vote majority and Mr Locke duly honoured his promise - well, sort of, with the aid of thick body paint, Y-fronts and shoes.
I'm not sure how Ms Barry will be able to follow in his footsteps and "sort of" simulate a dead body.
I'd be willing to let her off the hook if she agreed to sit in the Britomart train station for a suitable period, without taking a breath, while Mayor Len sang a lengthy waiata to her on the glories of commuter rail. Then lend her TV announcer voice to a promotional video for the project. I think I'd insist on Transport Minister Gerry Brownlee joining her.
After all, just six months ago he was rubbishing the latest Sinclair Knight Merz report on the tunnel - a report Mr Brownlee had ordered Auckland Council to commission - as falling "some way short of convincing the Government it should provide financial support".
He said that "in a nutshell the report says the case for building the CRL is weak now, [and] improves somewhat if it is built closer to 2030 - based on some extremely optimistic assumptions ...".
What a difference a few months and some bad polling makes.
On Friday, Ms Barry dashed out a press statement claiming the PM's announcement "marks the single biggest transport project affecting the North Shore since the bridge was opened in 1959 ...
"There is no doubt that North Shore residents will be celebrating this long overdue announcement of the most significant development many of us will see in our lifetime."
Rest assured, she wasn't referring to the CRL. She was beating up Mr Key's vague statement that "a new harbour crossing is likely to be needed between 2025 and 2030" and that the Government agrees with the Auckland Council that when it is built, it "should be a tunnel". Far from announcing the biggest thing to happen in anyone's lifetime, Mr Key announced "the first step in what will be a very long-term project is therefore to protect the route for the crossing, which we expect will occur before the end of the year once the details of the preferred alignment have been confirmed".
The North Shore MP seems to have missed the words "very long-term project" and "needed between 2025 and 2030". That's five to 10 years after Mr Key plans to start digging the CRL.
As for it being new, Transit NZ, now replaced by the NZ Transport Agency, lodged a "notice of requirement" for a tunnel route in 2009. In January, NZTA regional director Stephen Town said it was in discussion with Auckland Council and public submissions would open "sometime in 2014".
In the meantime, Ms Barry has a promise to deal with.