Obama was epic for who he was, and ACA was huge lift to shift a paradigm, but he was far too conventional in economic policy, failed at more a few things in foreign policy, didn't do a great job building his party. I give Biden huge props for recognizing that today's democratic party needed to jettison the "new democrat" globalist "GOP lite" economic paradigm the began with Clinton that was hollowing out the American worker's ability to stay in the middle class. I think over historic time that could be even more important than ACA, but time will tell.