Canada

The Greens, and to a lesser extent, the NDP have never had the opportunity to demonstrate the flagrant duplicity of the Liberals because they've never held power. In fact, I'd argue that the Liberal/Conservative hold on power has a great deal to do with the public's intolerance for truth tellers in politics. I'd also argue that the PPC are likely quite honest... they're just also deplorable.

My experience with the BQ is limited by my abysmal French skills, but it seems to me that they've routinely campaigned on a largely separatist, francophone, socialist platform and have delivered on those promises.