I'm still sort of astonished at the audacity of the GOP flip-flop on the Medicare cuts from ACA. Let's see if we can run this down...
1. Prominence: ACA was obviously one of the top Republican issues in 2010, and the Medicare cuts were a major issue within that in campaign materials and ads. Candidates, of course, make lots of commitments that few know about and then flip once in office...a flip is a bigger deal, presumably, the more you campaigned on it. Very high score.
2. Rapidity: We're three months into the new Congress. Not a record for flips, but pretty quick. Very high score.
3. Lack of intervening events: George W. Bush was against nation-building and for a humble foreign policy...until the September 11 attacks. Now, the idea that those attacks changed everything as far as the actual world is concerned was always pretty dicey, but Bush apologists aren't entirely wrong if they want to claim that he had good reason to break his promise. I can't think of any relevant intervening events since the election. Budget and economic projections now are basically similar to what they were then. Perfect score.
4. Lack of compromise or defeat: It's a raw deal to blame a pol for breaking a promise if he or she is defeated (as with Obama on some -- but not all -- of his torture/detention promises), or if the promise is broken as part of making as deal, as with Obama and the tax extensions in fall 2010. That's not happening here; the House GOP budget was entirely their doing, and supported by almost the entire conference. Perfect score.
5. Degree of flop: Did the pol modify the old position (again, see Obama and detention), or completely reverse it? Here, on the Medicare cuts, it's a total reversal, as far as I can see. Perfect score.
Really, this is an outstanding, impressive, flip-flop. Am I missing any categories?
[Updated, link added]