I believe the fashionable term for this is epistemic closure:
That the law is constitutional is best illustrated by the fact that—until recently—the Obama administration expended almost no energy defending it.
This is not what we call a logical argument.
It’s clear from the last three days that the defenders of Obamacare never actually bothered to devote any thought to legal arguments in defense of Obamacare. They really did believe it was self-evident. I don’t know whether to be relieved or appalled that they actually believed their own nonsense.