You've reframed the problem to wealth influencing politics, which still isn't something that needs to be fixed by taking money away from people. Redistribution is a decent solution to resource problems, but this isn't that kind of problem.

Ending money in politics is hard to do using the levers of democracy since those levers have already been purchased, so I understand the desire to end extreme wealth instead. There is another solution, though. We can end the influence of wealth on our politics without needing the government to do it for us.

Instead of trying to get the government to stop excess political spending, we should eliminate the incentive to accept excess political spending. People accept money to influence our democracy because they can use that money to get whatever they want from almost anyone, including you. You can't opt out because economic power is invisible. But we can make it visible, and give every individual the freedom to reject economic power that they feel is misused.

This is merit capitalism. http://meritcapitalism.com/