Sort of a water is wet moment in that the Leftist bias of Wikipedia has been amply demonstrated for quite a few years. Wikipedia of course depends upon an army of unpaid contributors who are usually highly politically motivated and who often have endless time on their hands in the basements of their moms. I have noticed with Wikipedia that the more apolitical and technical a subject is the more it can be trusted. (Within limits. I have read some truly dreadful Wikipedia articles on highly technical legal matters. Some things it is just very hard to dumb down sufficiently for non-experts to grasp even where bias is absent.) However, if politics, and that increasingly covers a broad swathe of our existence, enters in, Wikipedia is as reliable as the vagrant on the street yelling about the invisible demons in his head. Actually somewhat less so, as the vagrant believes what he is saying is factually correct.
Wikibias – The American Catholic