Who Should Secure Congressional Campaigns?

I'm not sure there is any one right answer to who should provide the oversight. I feel like every possible entity is vulnerable to outside pressure and influence, individuals deceitfully involving themselves, as well as the infallibility and bias of the more earnest, well intended individual.

As a medium, paper ballots are the way to go, with anonymity tied in, allowing some sort of general public observance of a logical, defacto tallying process.

If such a process exists, I have no clue and maybe that's just a pipe dream. Anyhow, here's to the 2020 election