http://www.usnews.com/opinion/blogs/peter-roff/2013/05/28/study-finds-fact-checkers-biased-against-republicans
I've noted a new MSM device that seems to be designed to turn conservative statements into "lies" and liberal opinions into "facts". Much like lead into gold, it doesn't work if you have a brain you use for something beyond keeping your head from collapsing, but it explains why a lot of the left finds these "fact checkers" to very "factual".
After all, it fits their biases, so it MUST be TRUE! But, perhaps the left ought consider the old saw that "if it conforms to your biases, you ought to strongly consider that it is FALSE".
The fact that, as the Lichter study shows, "A majority of Democratic statements (54 percent) were rated as mostly or entirely true, compared to only 18 percent of Republican statements," probably has more to do with how the statements were picked and the subjective bias of the fact checker involved than anything remotely empirical. Likewise, the fact that "a majority of Republican statements (52 percent) were rated as mostly or entirely false, compared to only 24 percent of Democratic statements" probably has more to do with spinning stories than it does with evaluating statements.
A lot of what goes on in politics, economics, society, etc is a LONG way from "fact". The modern world is loaded with "statistical science" which is pretty much an oxymoron. How good is the economy? Like a lot of such things "it depends" -- what you use to measure it, which parts you give the most focus, how you deal with government vs private, young vs old, etc.
If you can get some "Fact Check Site" to take your cherished position as the "true way" to view the glass (half empty, half full, twice as big as it needs to be, etc) and call the other side liars. The advantage as always goes to the dominant culture -- millions of people that only listen to one side of the news get another way to have their biases confirmed and continue to live a comfortable life in the the thrall of "The Party".