And there were a number of State supreme court elections that were alleged to have heavy monetary investment from a couple of billionaires that did not end up working in their favour.[1]
For that matter there is an Australian billionaire whose "investment" also does not appear to have worked in his favour [2]
I read somewhere that Rupert Murdoch was able to swing some elections a while ago in Australia and the UK. That was through his media ownership though.
There are other ways for money to impact politics beyond individual general elections. As well as funding community organizing and creating long-term propaganda, it's much easier to impact ballot initiatives (paid signature gathering works, for example, where paid canvassers don't.)
For that matter there is an Australian billionaire whose "investment" also does not appear to have worked in his favour [2]
[1] https://en.wikipedia.org/wiki/2025_Wisconsin_Supreme_Court_e...
[2] https://en.wikipedia.org/wiki/Clive_Palmer