Why would FOX news put a (D) next to Gov Mark Sanford name during his confession,?

http://current.com/items/90271095_fox-news-lies-again-lables-sanford-a-d-for-democratic.htm
Update: When everybody knows that he is a Republican? I thought FOX news was fair and balanced?
Update 2: Rada S- Please prove me wrong, I found this on several sights, not just one. I also found it on Youtube.
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