The Affordable Care Act has gotten off to a rocky start. Federal and state online health insurance exchanges, which opened for business at the beginning of the month, have been bedeviled by technical snags. And opposition to the law from some House Republicans blocked funding for the entire federal government, leading to its partial shutdown. In fact, with all the conflict and vituperation over Obamacare, it sometimes seems that one of the few things Democrats and Republicans agree on is that the law is imperfect at best. And they also agree that it could be improved.