“President Obama’s reelection, along with the Supreme Court’s ruling last June on his signature health-care reform, may seem to have guaranteed that the Affordable Care Act (ACA) will remain the law of the land. But that could turn out to be the easy part of Obamacare. Implementing the ACA’s main provisions by January 1, 2014 — the date on which the law is to take full effect — presents a more grueling and protracted set of tests.”