I don't know if I'd say its necessarily siphoning off just the left leaning though. I've voted Conservative for the 3 years I've been allowed, mostly because my political views were heriditary. As I am getting older I'm starting to adopt more and more of my own views - but I've still kept conservative since I'm in Alberta and its usually to my benefit anyways.
But the Pirate Party actually deals with issues I care about. Honestly, the GST change hasn't done much. 5% or 7%, most retailers just alter their price to accomodate their customers. When Gas gets too expensive I take the bus. The reason why voter apathy is so high is that they are like me: we don't feel any compelling reason to vote for Conservatives or Liberals since there is one thing we like for every one thing we dislike about their platform. It's stupid that I have to weigh whats important to me more than other things, rather then just have a party that shares my views.
So when a party comes around that actually holds one of my views, probably the one I feel strongly enough about, leaving itself open to its constituants for the other platforms, I'm going to jump on board. They probably won't get a majority, but if they keep any of the other parties from getting a majority, well lets just say I prefer the minority government. In order to pass a bill, they'll need the support of one of the smaller parties, and that gives the Pirate Party leverage to accomplish their goals.
So long as Liberals, NDP, and Conservatives are the only guys with a voice, no one is going to say a word about Copyright reform, its not mentioned on the television debates, its not listed as their platforms, they don't publicize it as a reason to vote for them.
What motion has there been towards Copyright reform before now? And do you think there will be one if they register and run?