The thing about the bully pulpit is that Presidents can make the most fantastic claims and it takes days to sort the reality from the myths. So as a public service, let's try to navigate the, er, remarkable Medicare discussion that President Obama delivered on Wednesday. It isn't easy.

Mr. Obama began by depicting a crisis in the entitlement state, noting that "our health-care system is placing an unsustainable burden on taxpayers," especially Medicare. Unless we find a way to cauterize this fiscal hemorrhage, "we will eventually be spending more on Medicare than every other government program combined. Put simply, our health-care program is our deficit problem. Nothing else even comes close."

On this score he's right. Medicare's unfunded liability—the gap between revenues and promised benefits—is currently some $37 trillion over the next 75 years. Yet the President uses this insolvency as an argument to justify the creation of another health-care entitlement, this time for most everyone under age 65. It's like a variation on the old Marx Brothers routine: "The soup is terrible and the portions are too small."

As astonishing, Mr. Obama claimed he can finance universal health care without adding "one dime to the deficit, now or in the future, period," in large part by pumping money out of Medicare. The $880 billion Senate plan he all but blessed this week would cut Medicare by as much as $500 billion, mainly by cutting what Mr. Obama called "waste and abuse." Perhaps this is related to the "waste and abuse" that Congresses of both parties have targeted dozens of times without ever cutting it.

Apparently this time Mr. Obama means it, though he said this doesn't mean seniors should listen to "demagoguery and distortion" about Medicare cuts. That's because Medicare is a "sacred trust," and the President swore to "ensure that you—America's seniors—get the benefits you've been promised."