What I don’t get about Canadian politics

Our last election was called as a result of the sponsorship scandal. As a result of that election, the Liberals formed a minority government – re-elected but spanked a little too. I can’t think of much that has come up since then that is really new. Sure, some details which haven’t been substantiated, but even if they are all true, they aren’t exactly more than I thought possible during the last election. So why the need for a new election now? Didn’t we already have one on this scandal? (Yes, it does bother me that I am onside with our PM on this one.)