In promoting the health care law, President Barack Obama is repeating his persistent and unsubstantiated assurance that Americans who like their health insurance can simply keep it. Republican rival Mitt Romney says quite the opposite, but his doomsday scenario is a stretch.

After the Supreme Court upheld the law last week, Obama stepped forward to tell Americans what good will come from it. Romney was quick to lay out the harm. But some of the evidence they gave to the court of public opinion was suspect.

A look at their claims and how they compare with the facts:

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