Indeed. The only way to make sure that politics are not corrupt is to make sure that we never elect a person of dubious morals or intellect. Right now, that's basically all we ever elect. If there's a person in power interested in misappropriating or exploiting that power for self-interest over the general interest, he will probably find a way to do so eventually.

This is why it's relevant when a politician has had an affair; if he is unwilling to uphold the most solemn covenants he makes in his lifetime, to the people to whom is the closest, and upon whom the negative impact of his actions will hit the hardest, why do we have any idea that he will be willing to uphold his covenant to perform in the general interest or uphold the Constitution when his covenant is with an amorphous, anonymous mass of "The People"?