Who Fact-Checks the Fact Checkers?

(Originally aired 07/16/2018) Guest: Angie Holan, Editor, PolitiFact Fact checking has become so popular that major news outlets do it on Presidential speeches in real-time. Political campaigns fact-check their opponents’ claims. But how sure can we be that the people doing the fact checking are not biased? That they’re not looking more critically on one party than another?