I tried Voyager and Boost but both had the same problem. Maybe it is an issue with my instance?

The rise in economic inequality in the United States appeared to be causing congressional ideological polarization—but congressional ideological polarization was also leading to increases in inequality, so causality was a vicious circle. Nolan McCarty, Keith T. Poole, and Howard Rosenthal found in 2007 that inequality exacerbated ideological polarization, and ideological polarization led to policies that further increased inequality. In other words, they found that people with vastly differential wealth had different policy preferences. But ideological differences between Republican and Democratic partisans led to the failure of redistributive policies, thus exacerbating inequality.

Basically, economic inequality leads to elite polarization (at the congress level) that limits the political agenda to policies that do not benefit the public, so that the public can only vote against its interest. This leads to more economic inequality and so forth. There are more layers to it, such as economic inequality creating elites in the private sector and leaving politics to incompetent people that are manipulated by the business elite. My initial description is somewhat simplistic, but essentially the public is cut off from the elite due to economic inequality, leading to political polarization as the only differentiating factor in policy, so that the public can only vote against its interest.

If you read this study, it mentions people are prone to affective polarization, that is a state of mind that is in itself extreme and it's related to people being myopic, that is governed by strong emotions such as panic instead of choosing rationally.

Frankly the people are the ones moving further to the right because the state does not educate them and regulate corporate power, transforming the public into a myopic panicked herd.