Median voter theorem pretty much proves that in a single member plurality system two parties will emerge and compete for the centre voter.
The theory has been well tested and seems to be pretty spot on.
The result? Well two parties basically adjust their platforms to be as accessible as possible.
Wasn`t always like that though. Any skim over George Grant`s seminal `Lament for a Nation`details distinct differences between the Conservatives and Liberals. Those differences have all but evaporated.
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