Mitt Romney is unveiling a new health care plan today, but he’s already falling into the same trap as President Obama by promising that people will keep their existing health insurance under his plan, something that he can’t possibly guarantee.

The problem that Obama ran into is that he claimed over and over again that anybody who liked their plan could keep it under the national health care law, but in reality, even if the law doesn’t explicitly force people to give up their coverage, it changes incentives and imposes new regulations so that people will in fact lose coverage.