First of all, it fires up the base. After this latest exercise in deception, we can be fairly sure that Republican leaders know perfectly well that Obamacare has failed to fail. But the party faithful don’t. Like anyone who writes about these issues, I get vast amounts of mail from people who know, just know, that insurance premiums are skyrocketing, that far more people have lost insurance because of Obummercare than have gained it, that all the horror stories are real, and that anyone who says otherwise is just a liberal shill.

Beyond that, the constant harping on alleged failure works as innuendo even if each individual claim collapses in the face of evidence. A recent poll by the Kaiser Family Foundation found that a majority of Americans know that more than eight million people enrolled in health exchanges; but it also found a majority of respondents believing that this was below expectations, and that the law was working badly.

So Republicans are spreading disinformation about health reform because it works, and because they can — there is no sign that they pay any political price when their accusations are proved false.