Earlier quoted context omitted.
That most often happens in one-party districts because the incumbent doesn't have to please the voters when the district would never go for the other party. The two party system itself is caused by first-past-the-post voting. In that system if there are more than two parties, the two most similar parties split the vote and both lose, giving them the incentive to merge together instead of running against each other, u…
It's not __caused__ by FPTP, but yeah that certainly doesn't help. But I am glad that my excessive campaigning on this site for Approval/Star/cardinal systems has had some effect :) (Very happy to see ordinal systems not being suggested) There's much more complexity to it all, but yeah, voting systems are important. The cardinal systems are just about better embedding preference while minimizing the capacity to hack.…
Isn't it? FPTP makes it all but impossible to sustain a third party because of the vote splitting effect. Even when there have been new major parties in the past, they replaced one of the major parties instead of coexisting alongside them for any significant period of time. The most viable districts for minor parties like the Green Party are the ones where the least similar major party is completely out of the running and then the minor party serves the role of the second party rather than a third.
> Where people are not investing time to vote.
But these things are related. If you have a two party system then you typically either have a clear choice where you know without doing much investigation which party you favor, or you don't align with either of the major parties and then no party satisfies you and your choice is basically a coin flip. Neither of these promote investigation because either the choice is obvious or the choice is unsatisfying and equivocal.
Wheres if you had e.g. four viable parties, there would much more likely be one that does closely represent your interests, and another that could come close, giving voters the incentive to at least pay enough attention to distinguish them.