Some obvious actions by politicians are called flip-flops. But during the day to day duties of any elected official the flip-flops abound and I rarely hear any complaints about it. The amendments, back room deals, earmarks or pork-barrel that contradicts position statements happen all the time.
In rebuttal to Erick Erickson I submit RealClear Politics

Yeah, well, it's like I asked a few months ago... "Hey, Romney: Ever hear of Principles?"