Even in June, well before those rowdy August town-hall meetings laid to rest all doubt about where the public stands on Obamacare, the administration knew it had a problem. For months the president had been trying to make his case for health-care reform but had mostly offered vague pronouncements about the need to extend insurance coverage and “bend the cost curve.” When the details began coming to light in late spring, and the public got a good look at what the administration and its allies in Congress actually have in mind, the polls showed a decisive and almost instantaneous shift …