Relentlessly positive, robust, and factual - Labour has unveiled its election strategy for 2020. Labour MPs were in Martinborough for their annual caucus retreat on Thursday - and their eyes are firmly on this year's election. Jacinda Ardern set the tone for the campaign, announcing Labour would voluntarily sign up to Facebook's transparency tool, in a bid to avoid anonymous fake news style advertisements that have plagued overseas campaigns. RNZ political reporter Yvette McCullough was there and filed this report.