Politicians will always do what is in their own best interest, always. They will also always tell you what they think you want to hear. Always.
If you don’t think that Sam Brownback wouldn’t flip in order to ensure his election as Governor, think again. He will do whatever it takes as he clearly demonstrated by suppporting Sibelius’ confirmation.
I think today is a good day to remember that this is not true of all politicians. It wasn't true of Jack Kemp or Ronald Reagan, for example.