The conventional wisdom among the political punditry is that 2012 Republican frontrunner Mitt Romney will be hamstrung by the health-insurance plan he helped craft as governor of Massachusetts, which included a mandate to purchase insurance. That may not be true. In conservative circles, the health-insurance mandate has become shorthand for government overreach. But while each GOP presidential hopeful has disavowed it on the campaign trial, in recent days two of Romney’s top competitors — former Utah Governor Jon Huntsman, who hasn’t declared his candidacy, and former Minnesota Governor Tim Pawlenty, whose Iowa barnstorming tour is well underway — have faced...