Just a quick note to say that Harper has done well with his gst promise and the Conservative campaign overall appears to be reflecting the fact they have now had 18 months to get themselves better organized than last time.
However, most polling I have seen since the federal government went into surplus suggests most voters put a higher priority on social spending (health in particular but also education, etc.) . See these recent CRIC poll numbers for example. The media I think should pay more attention to the appeal of this option not just income vs gst tax cuts.
In any event it is far from clear yet that the election will end up being about taxes.