Pamzie has blogged a copy of her essay/assignment on National’s 2005 election campaign.
While parts of it are certainly debatable, it’s a pretty fair review all up.
One small error is the statement Saatchi and Saatchi had a hand in the billboards. They had no part in them (or in any part of the campaign).
Also citing Wikipedia will generally lose you a mark. Great resource, but not one academics like people to cite.