Sailaway you need to get your facts straight. Daily Kos isnt "running with" that story. The story is what they call a "diary" which means ANYONE (even you) who wants to post one can go on Daily Kos and do it. There is no (zero, none) editorial review of diaries. It is a completely free speech zone where anyone can post anything they like.
So, you have found one kook willing to write a nutty diary on a blog. The right wing (in fact every wing) has a few kooks.
I kind of liked this one though, it is worthy of those tabloids at the supermarket checkout. "Palin daughter love child!!!!!!"
Next thing you know they will discover the child is spawn of an alien invasion!!!
Dont be too gullible my friend.