This is why I'm in favor of sortition instead of voting.
The majority of random people don't have combination of desire, corruption, sophistication, and political experience to pull off this kind of bribery.
Virtually every elected politician does.
~Everything about the election process selects for the worst kinds of people.
There is a lot of truth in this but I'm not convinced sortition is going to work either.
But what you could do is vote with a string attached and a penalty for being recalled that is going to make people think twice about running for office if their aim is to pull some kind of stunt. The 'you give me four years unconditionally' thing doesn't seem to work at all.