Let me guess, facts have a liberal bias?
Political leanings within a debunking organization mean much less than the actual "fact finding" methods they employ. Much of Snopes' 'research' is made up of member contributions to discussions on their message board. Whatever the group opinion is on a subject, becomes their judgement. Even though there's a plethora of documentation on several Obama lies out there, tough questions in the search box get "Sorry, no matches" when clearly a few minutes of searching any ".gov" site is full of facts straight from the horse's mouth.
Don't take my word for it...go read through the Snopes discussion forum yourself to see how they operate. Dissenters who bring opposing information often have their findings edited out.