Any credible 3rd party would be *immediately* corrupted. Like by next Tuesday.
By your measure, corruption is the norm then. Just part of the equation. That may explain a lot about why Republicans stand behind Trump. They expect their politicians to be corrupt. Democrats pretend they aren't equally corrupt. Third Parties promise they won't be as corrupt but they're human too.
I think we could all agree that Obama was the least corrupt president since Carter. As I recall he was worth about $1-2 Mil when he first took office(Mostly from book sales). He just bought a $12 million dollar house.
Good coffee, good weed, and time on my hands...