Politifact is infamous for their bias. Here’s an example of them rating the same exact statement very differently, depending on who made it:

http://www.politifact.com/truth-o-meter/statements/2015/jul/...

http://www.politifact.com/virginia/statements/2016/jun/20/do...

There are numerous studies that also show significant selection bias, that is they cherry-pick statements they fact-check.

Politifact itself makes no attempt to evaluate and correct for their own bias. The newspaper that runs it is liberal leaning, and has endorsed Hillary Clinton.

Because of the fact that Politifact tries to appear unbiased, their apparent bias is even more disappointing. Truly neutral fact-checking is something that would be very desirable. Perhaps the only way this will ever happen is by some sort of aggregation of left- and right-leaning “fact-checking.” Sort of like metacritic.