It's even worse than that. Take all the in-fighting you see on the left and imagine they actually had a "real" party instead of just being the Communists vs the Socialists vs the Entrenched Cronies.

Take all the hate they direct at the conservatives and imagine power the media would hold to show that "4 out of five parties think the fifth one is acting racist."

Take all the Mitt Romney's and imagine how much capitulating they would do to keep that from being said about them.

Now take all the capitulating the uniparty does behind closed doors, and realize that the most expedient thing for the Mitt Romney's to do is to side with some of the liberal parties against the other liberal parties in order to form a "coalition government." (A literal uniparty with actual paperwork.) And to do so they have to gain points with voters other than straight conservatives by pushing policies that mirror the other parties and pushing back against any policies that their own voter base wants if they are "too controversial."

And that's how Canada has five flavors of Communism.