I have thought about this a fair bit, and it seems like the only real way to completely eliminate such risk would be a benevolent AI overlord, as the problem yo

I have thought about this a fair bit, and it seems like the only real way to completely eliminate such risk would be a benevolent AI overlord, as the problem you mentioned is rooted in human nature. Realistically though, high transparency and strict regulation of money in politics to prevent tribalism is a good idea. An 'all campaign donations must be anonymous to the recipient' law would be unfeasible, so limiting contribution amounts severely is the only way. Unfortunately, even doing this would not change the fact that most politicians are in the same social group as the wealthy and powerful, so it is an imperfect solution. People inevitably show favoritism towards those they are friends with, so minimizing the effect any one person/group can have is key. This is why I agree with George Washington, political parties should not be a thing, they cause far more trouble than they are worth.