It will continue to be that way in every election as long as people resign themselves to voting for either party that has no intention of ever giving you a “fix” to the two party system. Why would a Democrat or a Republican want to get a third party elected? Makes 0 sense. Let’s say you vote for a Democrat… How does that then incentivize them to do anything differently than how they’re already doing it? Your voting for them is tacit approval of their current agenda and party machinations. If they don’t lose or get challenged by something further to the left, they will never move left. They will continue to pander towards centerist voters. Since our Overton window is already right of center with the Democrats basically being center-right and the Republicans being further right, they will only move rightwards with this strategy. They only pander towards centrists because the centrist vote isn’t guaranteed. So in order for them to move leftward, they need to see that the left voter is not a guaranteed vote. The only way to do that at the ballot box is by voting for someone further to the left than the Democratic party. Yes that might mean that Democrats start to lose, but if they do it’s their own damn fault for not appealing to the leftist voter.