The article reviews a few of PolitiFact's recent newsworthy problems, including the conflict of interest it showed in defending the Clinton Foundation with help from a grant from another nonprofit that shares a major donor.
It's worth a read. Here's a taste, from the conclusion:
PolitiFact publishes enough fact checks that it no doubt gets some right. But whether as a result of bias, incompetence, dubious financial incentives, or perhaps all of the above, PolitiFact has taken a wrecking ball to its reputation. It should be ignored altogether, but so long as PolitiFact remains a useful vehicle for applying a veneer of credibility to politicized judgments, the rest of the media will no doubt continue to cite it as an authority and use it as a cudgel.