I still think the biggest issue in the nation is electoral reform. This stuff about not getting to complain because you didn’t “do your duty” is nonsense. If you’re presented with choices you consider roughly equally catastrophic, then you may as well not vote. It’s no more morally right to vote for a part that has no chance.
Something like a proportional system or a mixed system like MMP (keeps the idea of voting for a specific candidate with a face and a personal stance, but adds a proportional aspect on top); along with something like IRV for president would do a hell of a lot to alleviate the false choice problem, allow people to really say who they want, and reign in some of the worst parts of the primary cycle. Like Bernie most but think Hillary is safer? Vote Bernie first and Hillary second, if Bernie loses all his votes go straight to Hillary. Think Hillary would do a better job but would prefer Bernie to any republican? Vote Hillary. Want to stick it to “the establishment”? Vote Bernie, Trump, Carson, and then everyone else. It’s simple to understand too.
Unfortunately, you can’t run on that. President? The President already can’t pass laws, but it would be doubly difficult to sell “I’ll lead Congress in an initiative to amend the Constitution.” Congress? More doable, but in this political climate? Only if you can get both parties on board, and the big parties both won’t want to lose their standing in-built power and there’s too much hailing of “The Constitution Is A Sacred Document Perfect As Written” in the public consciousness, deterring especially anyone who has to try and get ultra-conservatives to vote for them.
The best you could do is try and sell it to the parties as a way to consolidate power (since the proportional aspect of MMP is selected off a party list), while selling it to the people as a way to have their voice matter by giving more refined choices. Both are true, but a hard sell together.
There’s also the thought that having a two-party system forces some nebulous “moderateness” because they need to “appeal to the center”, but I think it’s become clear in recent years that’s not the case. And proportional systems should generally have the largest parties support centrist stances to varying degrees.
The biggest problem is their ramifications aren’t as immediately tangible to people as “get money out of politics” or “universal healthcare” or “address racial issues” so it’s hard to get fired up about. It’s a meta-problem. It’s a problem to solve before you start addressing the actual problems, because it’s a precursor to fixing the system to get shit done. Not that electoral reform can’t be worked on concurrently with those other issues, but it’s hard to get people campaigning for a change in system. Especially since most people like “their” guy in DC, but just hate Congress as a whole.
E: To be clear, I’ll be voting for Sanders, or Hillary if that fails, but in principle I can’t fault anyone for taking a “I legitimately hate both sides” stance.