The opposite of your view is what is happening for both parties. It's laughable to look at Republicans and think they are moving to the middle. The democrats ha

The opposite of your view is what is happening for both parties. It's laughable to look at Republicans and think they are moving to the middle. The democrats have partly moved to the middle (Biden being a great example). But in primaries, which have the most energized voters on both parties tend to get less people in the middle. In practice, in reality, it doesn't work that way. Also gerrymandering tends to make districts even more polarized.