While I don't necessarily disagree with your gist here, I don't think it is accurate to characterize the ACA as "of the left". It was just Romneycare expanded to the Federal level, the "left" couldn't even get the "public option" included in the final bill. The whole thing was successful in that it got health insurance to a whole lot of people who didn't have it before, an outcome supported by many or even most on the left, but the actual ACA isn't really something leftists wanted or genuinely support as anything more than a stopgap on the path to actual reform. If the ACA actually did things to drive rent seeking behavior out of the health care industry and guarantee universal access it would be a great example of the phenomenon you are describing. The actual ACA is a much better example of the Republicans (and the the health care industry) running circles around the Dems during that era than of the Dems implementing leftist policy,