Dion trending up

As I understand it with daily tracking polls, its' not so much the numbers or the gap, its the trendline that's important. In this Canadian Press Harris/Decima poll, Harper is trending down while Dion is trending up.
And over at the Canoe blog, Paul Turenne has some questions about that gas price spike:

It is remarkably bad luck for the Liberals and their Green Shift that gas prices spiked the way they did across Canada last Friday,. . .
Anyway, who would benefit more than the Tories, and be hurt more than the Liberals, when Canadians are reminded right in the middle of a campaign just how much gas costs already? Price of crude goes down, price of gas jumps through the roof. Even with a hurricane, that's tough to explain. . . I'm just sayin' ...