I have little interest in streamlining government or in making it more efficient, for I mean to reduce its size. I do not undertake to promote welfare, for I propose to extend freedom. My aim is not to pass laws, but to repeal them. It is not to inaugurate new programs, but to cancel old ones that do violence to the Constitution, or that have failed in their purpose, or that impose on the people an unwarranted financial burden. I will not attempt to discover whether legislation is "needed" before I have first determined whether it is constitutionally permissible. And if I should later be attacked for neglecting my constituents’ "interests," I shall reply that I was informed their main interest is liberty and that in that cause I am doing the very best I can.

Barry Goldwater,perhaps the last honest politician.Despite this honesty he was also a bit of a fruitcake.

yo are correct that the answer is Barry Goldwater. There have been a few other honest politicians but they are rare. I would suggest that Paul Wellstone was honest and Ron Paul is honest.