This will be remarkably ineffective except for the cash flow of the agency that got the contract to run the campaign.
This is like bringing a knife to a gun fight, or to put it clearly running an advertising campaign when it requires issues management/public relations skills.
Clue to the Premier: the word is "unequivocal".
Unfortunately, the Premier said this and the Globe quotes him verbatim: "It was a simple equivocal promise. And he broke it.”
If it was an equivocal promise, i.e. one that is "of uncertain nature or significance", then we'd find it hard thing to break. If we applied another meaning to equivocate, namely designed to mislead, then we'd expect that Harper's promise was something couldn't have been trusted in the first place.