I think it’s one of the flaws with representative democracy. When faced with a choice between what’s good for the country/state vs. what’s popular (or just good for their district), what should an elected official pick? If they go with the former, they will eventually be replaced by someone who votes the other way, and we’ll end up with a government of elected officials who only vote selfishly (to get reelected by supporting public opinion, I mean).

Maybe proportional voting would help with legislatures to avoid that, but I don’t see a great fix for executives. And proportional voting can also have its own flaws by making parties more influential. The best is trying to elect people who can convince the public/their constituents that what’s good for the country (or state) is also good for the people, and change public opinion on the topic. Obama (preceded by VP Biden) coming out in favor of gay marriage worked pretty well on that front. So I guess we’re just back to trying to elect the best people, or at least the most influential. But that’s also why Trump has been successful politically and that sucks, so I don’t know.