t was among the day’s most probing questions about health care, with ramifications for tens of millions of Americans and the presidential campaign.

But it did not come from a Supreme Court justice. It came from Jay Leno on “The Tonight Show,’’ and it was directed to his guest, Mitt Romney.

What might happen, Leno asked Tuesday, if the Supreme Court rules President Obama’s health care overhaul is unconstitutional? How will people – including children – with preexisting medical problems cope?

The lack of a clear answer to that question, and many others raised by the prospect that the law could be overturned, may force candidates to rewrite their political scripts. If the high court in June rules the law invalid, Republicans will no longer have the luxury of addressing Obama’s health care plan with a simple “I am against it’’ and move on to the next issue.

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