JAMES TARANTO: Those Unattainable Invincibles: MoveOn.org worries about adverse selection.

On Friday we analyzed a fatuous article in which the Washington Post’s Ryan Cooper tried to reassure his left-liberal readers that they needn’t worry about the next phase of the ObamaCare disaster–that is, the third phase, known as “adverse selection.” Adverse selection will occur when young, healthy adults fail to purchase insurance at inflated prices, which ObamaCare needs them to do to sustain the artificially low premiums of the middle-aged and those with pre-existing conditions.

Well, you’ll never guess who’s terrified of adverse selection. “Only 29% of uninsured young people now say they plan to sign up for Obamacare,” warns an email we received today from one Mark Crain:

This could become a gigantic problem, because the only way we can afford to cover all the people with pre-existing conditions is if younger, healthier people enroll as well. If only sick people sign up, our entire health insurance system falls apart.

And who is this Mark Crain? He’s with MoveOn.org, that chronic affliction on the American body politic since 1998. Laughably, Crain blames adverse selection on “one-sided press coverage.”

Well, he’s kinda right — if it weren’t for one-sided press coverage, ObamaCare never would have passed. Heck, Obama never would have been elected.