Unlike Norway, we don't have a parliamentary system, so there's no multi-party viability, only first-past-the-post which promotes a 2-party system. We do have state based representation in the Senate, which allows equal representation by state, and district level representation in the House. So ultimately any legislation has to go through both those to pass, removing any "tyranny" those of us who live in populous areas might have on the rest of the country.