From Glen Greenwald today:

I have repeatedly called Glenn Greenwald one of the least honest in the leftosphere. I still hold that position. That said, I have just as often pointed out that the supposed “fact checkers” are anything but. that was never more apparent than when Greenwald turned on them finally, apparently the man still has something of a conscience at least.Ask yourself the rhetorical question of why it took this long for PolitiFact to come up with this admission.The answer is as I said 5 years ago.

it’s a trick the mainstream media of which PolitiFact is A part has been using for time in memoriam. Whip them up with headlines on page one… and then when it’s found out that you got it wrong, or more probably, you were just plain lying, run a correction on page 23 in a small paragraph below the fold.