The problem I have with PR is the inevitable fact that there will be a few single issue parties. With minority governments you could end up with two parties with 45% of the vote each and three single issue parties at 3% each. That means that the governing party will have to partner with two of the single issue parties to pass anything. What happens if one of those single issue parties is the "Super right wing religious zealots party"? How would you feel if every single bill had an unrelated religious rider tacked on?
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