I'm not sure there are any politicians who aren't nuts to some degree. Similar to many CEOs and high powered lawyers, investment bankers...some of them are borderline psychos. I suppose the differences can be placed on a continuum of how much they market themselves relative to any good they do for their country.
When you are enjoying one of your favourite drinks, be it alcohol, coffee, cola or ice water, ponder that last sentence and make a list, in one column create the title, "Entered politics to do more for the country without personal gain", in another column a contradictory title, "Entered politics to do more for themselves than their nations benefit".
You may arrive at a greater appreciation for the complexity America of human nature that the world is facing.