The same way they did. People run on a platform and hopefully vote based on how their constituents want them to. Sure, it's not perfect, but literally the only motivations they have to vote one way or another are the will of their constituents and their own honest opinion. There's no selling your votes or pandering to political leaders or special interest groups that you're afraid of. Again, we know that right now the average citizen's opinion isn't reflected in policy at all and that the people who participate in vote buying and intimidation do get results. Big money, political leaders, and special interests have much more power and representation than regular citizens. Our own representation is so poor right now that decreasing those other powers can only increase the quality of our representation.