For the most part, politicians go into politics because they can’t cut it in the private sector and politics are short cut to prestige, power and money. A few of them are really true believers, who really think that they can make a difference, but those are few and far between.
Remember when Lindsey Graham was working the Impeachment Committee and we all admired him? Well, that was before the Democrats found out he was Gay and that he had served as a JAG. After that, Graham could never be counted on when we needed him most.
Graham’s one vote on the committee is what kept Clinton in office.