I am a one-issue voter (whenever it's on the ballot) and my issue is voting reform because, in my view, the two party system America (and almost Canada!) is stuck with is just making inter-party discussions on policies impossible. Once the political class has stratified like it has in America and can box out anyone who doesn't pass a litmus test of dozens of issues (Oh, you're pro-gun rights but also pro-abortion access? Sorry, neither us nor the other guys want you) then the political system will quickly break down.

We desperately need elections where more than just the two dominant parties can compete without a spoiler effect.

This is happening, just FYI, up in Canada right now - there are four parties worth talking about - Liberals, Conservatives, NDP, Bloc Quebecois - the last two are essentially just regional parties which do occasionally win surprise seats but mostly just exist within a localized area. That is enough, in our parliamentary system to force cooperation at a federal level - but without serious action I can't see any ending in sight other than slowly devolving to American politics.