Surely that is a large part of it; economic reasons can reduce the reach and effectiveness of an institution. Aside from that, alignment with one party is a dangerous thing. Even the temples attended by very liberal Jews do not tend to support, singularly,candidates or parties. Rather, like Catholics, thoughtful Jews and Jewish bodies mostly support positions (support for Israel, human rights issues, etc.) Like Catholics are supposed to, Jews prioritize, in accordance with their moral and ethical priorities, both personally and as a community.
Ditto for the RCC. It’s the positions, and the priority level of those positions (the reach of those positions) which is supposed to determine the thoughtful Catholic’s voting choices and civil participation. And anyone who doesn’t know what the legitimate priorities are, is poorly catechized, has a poorly informed conscience, or is in heavy denial.
The Church has spoken plainly, on issues and on the hierarchy of those issues. Anyone who is confused about that, or who denies that, has been selecively listening.